Finding the Fourth Proportional to 2,309,085.48, 3,186,542.58 and 1,290,490.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,309,085.48 : 3,186,542.58 = 1,290,490.20 : x
2. Step 2: Convert to fraction form
   2,309,085.48/3,186,542.58 = 1,290,490.20/x
3. Step 3: Cross multiply
   2,309,085.48x = 3,186,542.58 × 1,290,490.20
4. Step 4: Simplify right side
   2,309,085.48x = 4,112,201,971,372.72
5. Step 5: Solve for x
   x = 4,112,201,971,372.72/2,309,085.48
6. Step 6: Final answer
   x = 1,780,879.06