Finding the Fourth Proportional to 76,446.87, 105,498.12 and 42,458.55

Step by Step Solution

1. Step 1: Write the proportion equation
   76,446.87 : 105,498.12 = 42,458.55 : x
2. Step 2: Convert to fraction form
   76,446.87/105,498.12 = 42,458.55/x
3. Step 3: Cross multiply
   76,446.87x = 105,498.12 × 42,458.55
4. Step 4: Simplify right side
   76,446.87x = 4,479,297,737.25
5. Step 5: Solve for x
   x = 4,479,297,737.25/76,446.87
6. Step 6: Final answer
   x = 58,593.60