Finding the Fourth Proportional to 78,570.91, 108,425.37 and 42,760

Step by Step Solution

1. Step 1: Write the proportion equation
   78,570.91 : 108,425.37 = 42,760 : x
2. Step 2: Convert to fraction form
   78,570.91/108,425.37 = 42,760/x
3. Step 3: Cross multiply
   78,570.91x = 108,425.37 × 42,760
4. Step 4: Simplify right side
   78,570.91x = 4,636,268,821.20
5. Step 5: Solve for x
   x = 4,636,268,821.20/78,570.91
6. Step 6: Final answer
   x = 59,007.45