Finding the Fourth Proportional to 76,234.89, 105,206.45 and 42,240.20

Step by Step Solution

1. Step 1: Write the proportion equation
   76,234.89 : 105,206.45 = 42,240.20 : x
2. Step 2: Convert to fraction form
   76,234.89/105,206.45 = 42,240.20/x
3. Step 3: Cross multiply
   76,234.89x = 105,206.45 × 42,240.20
4. Step 4: Simplify right side
   76,234.89x = 4,443,941,068.86
5. Step 5: Solve for x
   x = 4,443,941,068.86/76,234.89
6. Step 6: Final answer
   x = 58,292.75