Finding the Fourth Proportional to 76,381.87, 105,403.86 and 42,391.78

Step by Step Solution

1. Step 1: Write the proportion equation
   76,381.87 : 105,403.86 = 42,391.78 : x
2. Step 2: Convert to fraction form
   76,381.87/105,403.86 = 42,391.78/x
3. Step 3: Cross multiply
   76,381.87x = 105,403.86 × 42,391.78
4. Step 4: Simplify right side
   76,381.87x = 4,468,257,244.27
5. Step 5: Solve for x
   x = 4,468,257,244.27/76,381.87
6. Step 6: Final answer
   x = 58,498.92