Finding the Fourth Proportional to 76,711.34, 105,861.30 and 42,720.23

Step by Step Solution

1. Step 1: Write the proportion equation
   76,711.34 : 105,861.30 = 42,720.23 : x
2. Step 2: Convert to fraction form
   76,711.34/105,861.30 = 42,720.23/x
3. Step 3: Cross multiply
   76,711.34x = 105,861.30 × 42,720.23
4. Step 4: Simplify right side
   76,711.34x = 4,522,419,084.10
5. Step 5: Solve for x
   x = 4,522,419,084.10/76,711.34
6. Step 6: Final answer
   x = 58,953.72