Finding the Fourth Proportional to 1,490,398,406.48, 2,056,689,919.86 and 812,200,956

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490,398,406.48 : 2,056,689,919.86 = 812,200,956 : x
2. Step 2: Convert to fraction form
   1,490,398,406.48/2,056,689,919.86 = 812,200,956/x
3. Step 3: Cross multiply
   1,490,398,406.48x = 2,056,689,919.86 × 812,200,956
4. Step 4: Simplify right side
   1,490,398,406.48x = 1,670,445,519,105,855,232
5. Step 5: Solve for x
   x = 1,670,445,519,105,855,232/1,490,398,406.48
6. Step 6: Final answer
   x = 1,120,804,686.75