Finding the Fourth Proportional to 256,123.28, 384,242.01 and 78,648.22

Step by Step Solution

1. Step 1: Write the proportion equation
   256,123.28 : 384,242.01 = 78,648.22 : x
2. Step 2: Convert to fraction form
   256,123.28/384,242.01 = 78,648.22/x
3. Step 3: Cross multiply
   256,123.28x = 384,242.01 × 78,648.22
4. Step 4: Simplify right side
   256,123.28x = 30,219,950,135.72
5. Step 5: Solve for x
   x = 30,219,950,135.72/256,123.28
6. Step 6: Final answer
   x = 117,989.86