Finding the Fourth Proportional to 89,631.75, 123,425.04 and 87,642.69

Step by Step Solution

1. Step 1: Write the proportion equation
   89,631.75 : 123,425.04 = 87,642.69 : x
2. Step 2: Convert to fraction form
   89,631.75/123,425.04 = 87,642.69/x
3. Step 3: Cross multiply
   89,631.75x = 123,425.04 × 87,642.69
4. Step 4: Simplify right side
   89,631.75x = 10,817,302,518.96
5. Step 5: Solve for x
   x = 10,817,302,518.96/89,631.75
6. Step 6: Final answer
   x = 120,686.06