Finding the Fourth Proportional to 88,945.30, 133,089.90 and 81,072.10

Step by Step Solution

1. Step 1: Write the proportion equation
   88,945.30 : 133,089.90 = 81,072.10 : x
2. Step 2: Convert to fraction form
   88,945.30/133,089.90 = 81,072.10/x
3. Step 3: Cross multiply
   88,945.30x = 133,089.90 × 81,072.10
4. Step 4: Simplify right side
   88,945.30x = 10,789,877,681.79
5. Step 5: Solve for x
   x = 10,789,877,681.79/88,945.30
6. Step 6: Final answer
   x = 121,309.14