Finding the Fourth Proportional to 88,939.30, 133,080.90 and 81,066.10

Step by Step Solution

1. Step 1: Write the proportion equation
   88,939.30 : 133,080.90 = 81,066.10 : x
2. Step 2: Convert to fraction form
   88,939.30/133,080.90 = 81,066.10/x
3. Step 3: Cross multiply
   88,939.30x = 133,080.90 × 81,066.10
4. Step 4: Simplify right side
   88,939.30x = 10,788,349,547.49
5. Step 5: Solve for x
   x = 10,788,349,547.49/88,939.30
6. Step 6: Final answer
   x = 121,300.14