Finding the Fourth Proportional to 2,155,776.10, 3,233,664.15 and 639,513.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155,776.10 : 3,233,664.15 = 639,513.70 : x
2. Step 2: Convert to fraction form
   2,155,776.10/3,233,664.15 = 639,513.70/x
3. Step 3: Cross multiply
   2,155,776.10x = 3,233,664.15 × 639,513.70
4. Step 4: Simplify right side
   2,155,776.10x = 2,067,972,525,123.85
5. Step 5: Solve for x
   x = 2,067,972,525,123.85/2,155,776.10
6. Step 6: Final answer
   x = 959,270.55