Finding the Fourth Proportional to 89,677.12, 134,423.42 and 39,780.72

Step by Step Solution

1. Step 1: Write the proportion equation
   89,677.12 : 134,423.42 = 39,780.72 : x
2. Step 2: Convert to fraction form
   89,677.12/134,423.42 = 39,780.72/x
3. Step 3: Cross multiply
   89,677.12x = 134,423.42 × 39,780.72
4. Step 4: Simplify right side
   89,677.12x = 5,347,460,432.46
5. Step 5: Solve for x
   x = 5,347,460,432.46/89,677.12
6. Step 6: Final answer
   x = 59,630.15