Finding the Fourth Proportional to 213,875.16, 320,747.94 and 89,187

Step by Step Solution

1. Step 1: Write the proportion equation
   213,875.16 : 320,747.94 = 89,187 : x
2. Step 2: Convert to fraction form
   213,875.16/320,747.94 = 89,187/x
3. Step 3: Cross multiply
   213,875.16x = 320,747.94 × 89,187
4. Step 4: Simplify right side
   213,875.16x = 28,606,546,524.78
5. Step 5: Solve for x
   x = 28,606,546,524.78/213,875.16
6. Step 6: Final answer
   x = 133,753.48