Finding the Fourth Proportional to 88,961.60, 133,280.40 and 42,111.20

Step by Step Solution

1. Step 1: Write the proportion equation
   88,961.60 : 133,280.40 = 42,111.20 : x
2. Step 2: Convert to fraction form
   88,961.60/133,280.40 = 42,111.20/x
3. Step 3: Cross multiply
   88,961.60x = 133,280.40 × 42,111.20
4. Step 4: Simplify right side
   88,961.60x = 5,612,597,580.48
5. Step 5: Solve for x
   x = 5,612,597,580.48/88,961.60
6. Step 6: Final answer
   x = 63,090.12