Finding the Fourth Proportional to 89,609.15, 134,432.10 and 74,920.72

Step by Step Solution

1. Step 1: Write the proportion equation
   89,609.15 : 134,432.10 = 74,920.72 : x
2. Step 2: Convert to fraction form
   89,609.15/134,432.10 = 74,920.72/x
3. Step 3: Cross multiply
   89,609.15x = 134,432.10 × 74,920.72
4. Step 4: Simplify right side
   89,609.15x = 10,071,749,723.11
5. Step 5: Solve for x
   x = 10,071,749,723.11/89,609.15
6. Step 6: Final answer
   x = 112,396.44