Finding the Fourth Proportional to 76,639.14, 105,753.69 and 42,642.27

Step by Step Solution

1. Step 1: Write the proportion equation
   76,639.14 : 105,753.69 = 42,642.27 : x
2. Step 2: Convert to fraction form
   76,639.14/105,753.69 = 42,642.27/x
3. Step 3: Cross multiply
   76,639.14x = 105,753.69 × 42,642.27
4. Step 4: Simplify right side
   76,639.14x = 4,509,577,402.48
5. Step 5: Solve for x
   x = 4,509,577,402.48/76,639.14
6. Step 6: Final answer
   x = 58,841.70