Finding the Fourth Proportional to 89,128.90, 133,603.34 and 55,872.28

Step by Step Solution

1. Step 1: Write the proportion equation
   89,128.90 : 133,603.34 = 55,872.28 : x
2. Step 2: Convert to fraction form
   89,128.90/133,603.34 = 55,872.28/x
3. Step 3: Cross multiply
   89,128.90x = 133,603.34 × 55,872.28
4. Step 4: Simplify right side
   89,128.90x = 7,464,723,221.42
5. Step 5: Solve for x
   x = 7,464,723,221.42/89,128.90
6. Step 6: Final answer
   x = 83,752.00