Finding the Fourth Proportional to 659,061.71, 987,913.79 and 259,540.55

Step by Step Solution

1. Step 1: Write the proportion equation
   659,061.71 : 987,913.79 = 259,540.55 : x
2. Step 2: Convert to fraction form
   659,061.71/987,913.79 = 259,540.55/x
3. Step 3: Cross multiply
   659,061.71x = 987,913.79 × 259,540.55
4. Step 4: Simplify right side
   659,061.71x = 256,403,687,111.48
5. Step 5: Solve for x
   x = 256,403,687,111.48/659,061.71
6. Step 6: Final answer
   x = 389,043.52