Finding the Fourth Proportional to 89,404.38, 134,139.27 and 84,122.78

Step by Step Solution

1. Step 1: Write the proportion equation
   89,404.38 : 134,139.27 = 84,122.78 : x
2. Step 2: Convert to fraction form
   89,404.38/134,139.27 = 84,122.78/x
3. Step 3: Cross multiply
   89,404.38x = 134,139.27 × 84,122.78
4. Step 4: Simplify right side
   89,404.38x = 11,284,167,628.87
5. Step 5: Solve for x
   x = 11,284,167,628.87/89,404.38
6. Step 6: Final answer
   x = 126,214.93