Finding the Fourth Proportional to 76,299.50, 105,288.18 and 42,306.74

Step by Step Solution

1. Step 1: Write the proportion equation
   76,299.50 : 105,288.18 = 42,306.74 : x
2. Step 2: Convert to fraction form
   76,299.50/105,288.18 = 42,306.74/x
3. Step 3: Cross multiply
   76,299.50x = 105,288.18 × 42,306.74
4. Step 4: Simplify right side
   76,299.50x = 4,454,399,129.89
5. Step 5: Solve for x
   x = 4,454,399,129.89/76,299.50
6. Step 6: Final answer
   x = 58,380.45