Finding the Fourth Proportional to 89,631.87, 123,425.22 and 87,642.81

Step by Step Solution

1. Step 1: Write the proportion equation
   89,631.87 : 123,425.22 = 87,642.81 : x
2. Step 2: Convert to fraction form
   89,631.87/123,425.22 = 87,642.81/x
3. Step 3: Cross multiply
   89,631.87x = 123,425.22 × 87,642.81
4. Step 4: Simplify right side
   89,631.87x = 10,817,333,105.67
5. Step 5: Solve for x
   x = 10,817,333,105.67/89,631.87
6. Step 6: Final answer
   x = 120,686.24