Finding the Fourth Proportional to 76,391.85, 105,417.63 and 42,401.76

Step by Step Solution

1. Step 1: Write the proportion equation
   76,391.85 : 105,417.63 = 42,401.76 : x
2. Step 2: Convert to fraction form
   76,391.85/105,417.63 = 42,401.76/x
3. Step 3: Cross multiply
   76,391.85x = 105,417.63 × 42,401.76
4. Step 4: Simplify right side
   76,391.85x = 4,469,893,047.03
5. Step 5: Solve for x
   x = 4,469,893,047.03/76,391.85
6. Step 6: Final answer
   x = 58,512.70