Finding the Fourth Proportional to 76,711.12, 105,860.16 and 42,718.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,711.12 : 105,860.16 = 42,718.72 : x
2. Step 2: Convert to fraction form
   76,711.12/105,860.16 = 42,718.72/x
3. Step 3: Cross multiply
   76,711.12x = 105,860.16 × 42,718.72
4. Step 4: Simplify right side
   76,711.12x = 4,522,210,534.20
5. Step 5: Solve for x
   x = 4,522,210,534.20/76,711.12
6. Step 6: Final answer
   x = 58,951.17