Finding the Fourth Proportional to 272,061.88, 408,733.16 and 256,956.20

Step by Step Solution

1. Step 1: Write the proportion equation
   272,061.88 : 408,733.16 = 256,956.20 : x
2. Step 2: Convert to fraction form
   272,061.88/408,733.16 = 256,956.20/x
3. Step 3: Cross multiply
   272,061.88x = 408,733.16 × 256,956.20
4. Step 4: Simplify right side
   272,061.88x = 105,026,519,607.59
5. Step 5: Solve for x
   x = 105,026,519,607.59/272,061.88
6. Step 6: Final answer
   x = 386,039.09