Finding the Fourth Proportional to 92,404.70, 138,315.45 and 89,488.70

Step by Step Solution

1. Step 1: Write the proportion equation
   92,404.70 : 138,315.45 = 89,488.70 : x
2. Step 2: Convert to fraction form
   92,404.70/138,315.45 = 89,488.70/x
3. Step 3: Cross multiply
   92,404.70x = 138,315.45 × 89,488.70
4. Step 4: Simplify right side
   92,404.70x = 12,377,669,810.42
5. Step 5: Solve for x
   x = 12,377,669,810.42/92,404.70
6. Step 6: Final answer
   x = 133,950.65