Finding the Fourth Proportional to 76,420.50, 105,456.15 and 42,426.79

Step by Step Solution

1. Step 1: Write the proportion equation
   76,420.50 : 105,456.15 = 42,426.79 : x
2. Step 2: Convert to fraction form
   76,420.50/105,456.15 = 42,426.79/x
3. Step 3: Cross multiply
   76,420.50x = 105,456.15 × 42,426.79
4. Step 4: Simplify right side
   76,420.50x = 4,474,165,666.62
5. Step 5: Solve for x
   x = 4,474,165,666.62/76,420.50
6. Step 6: Final answer
   x = 58,546.67