Finding the Fourth Proportional to 256,406.52, 384,598.62 and 78,931.56

Step by Step Solution

1. Step 1: Write the proportion equation
   256,406.52 : 384,598.62 = 78,931.56 : x
2. Step 2: Convert to fraction form
   256,406.52/384,598.62 = 78,931.56/x
3. Step 3: Cross multiply
   256,406.52x = 384,598.62 × 78,931.56
4. Step 4: Simplify right side
   256,406.52x = 30,356,969,050.45
5. Step 5: Solve for x
   x = 30,356,969,050.45/256,406.52
6. Step 6: Final answer
   x = 118,393.90