Finding the Fourth Proportional to 1,490,139.72, 2,235,209.78 and 479,239.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490,139.72 : 2,235,209.78 = 479,239.54 : x
2. Step 2: Convert to fraction form
   1,490,139.72/2,235,209.78 = 479,239.54/x
3. Step 3: Cross multiply
   1,490,139.72x = 2,235,209.78 × 479,239.54
4. Step 4: Simplify right side
   1,490,139.72x = 1,071,200,902,380.78
5. Step 5: Solve for x
   x = 1,071,200,902,380.78/1,490,139.72
6. Step 6: Final answer
   x = 718,859.37