Finding the Fourth Proportional to 85,940.52, 128,914.27 and 40,938.74

Step by Step Solution

1. Step 1: Write the proportion equation
   85,940.52 : 128,914.27 = 40,938.74 : x
2. Step 2: Convert to fraction form
   85,940.52/128,914.27 = 40,938.74/x
3. Step 3: Cross multiply
   85,940.52x = 128,914.27 × 40,938.74
4. Step 4: Simplify right side
   85,940.52x = 5,277,587,781.82
5. Step 5: Solve for x
   x = 5,277,587,781.82/85,940.52
6. Step 6: Final answer
   x = 61,409.77