Finding the Fourth Proportional to 76,716.57, 105,868.90 and 42,731.58

Step by Step Solution

1. Step 1: Write the proportion equation
   76,716.57 : 105,868.90 = 42,731.58 : x
2. Step 2: Convert to fraction form
   76,716.57/105,868.90 = 42,731.58/x
3. Step 3: Cross multiply
   76,716.57x = 105,868.90 × 42,731.58
4. Step 4: Simplify right side
   76,716.57x = 4,523,945,369.86
5. Step 5: Solve for x
   x = 4,523,945,369.86/76,716.57
6. Step 6: Final answer
   x = 58,969.60