Finding the Fourth Proportional to 256,139.30, 359,119.90 and 256,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   256,139.30 : 359,119.90 = 256,139.30 : x
2. Step 2: Convert to fraction form
   256,139.30/359,119.90 = 256,139.30/x
3. Step 3: Cross multiply
   256,139.30x = 359,119.90 × 256,139.30
4. Step 4: Simplify right side
   256,139.30x = 91,984,719,802.07
5. Step 5: Solve for x
   x = 91,984,719,802.07/256,139.30
6. Step 6: Final answer
   x = 359,119.90