Finding the Fourth Proportional to 76,734.43, 105,879.48 and 42,742.05

Step by Step Solution

1. Step 1: Write the proportion equation
   76,734.43 : 105,879.48 = 42,742.05 : x
2. Step 2: Convert to fraction form
   76,734.43/105,879.48 = 42,742.05/x
3. Step 3: Cross multiply
   76,734.43x = 105,879.48 × 42,742.05
4. Step 4: Simplify right side
   76,734.43x = 4,525,506,306.80
5. Step 5: Solve for x
   x = 4,525,506,306.80/76,734.43
6. Step 6: Final answer
   x = 58,976.21