Finding the Fourth Proportional to 213,713.16, 320,598.90 and 89,025

Step by Step Solution

1. Step 1: Write the proportion equation
   213,713.16 : 320,598.90 = 89,025 : x
2. Step 2: Convert to fraction form
   213,713.16/320,598.90 = 89,025/x
3. Step 3: Cross multiply
   213,713.16x = 320,598.90 × 89,025
4. Step 4: Simplify right side
   213,713.16x = 28,541,317,072.50
5. Step 5: Solve for x
   x = 28,541,317,072.50/213,713.16
6. Step 6: Final answer
   x = 133,549.65