Finding the Fourth Proportional to 78,707.40, 108,618.58 and 42,899.73

Step by Step Solution

1. Step 1: Write the proportion equation
   78,707.40 : 108,618.58 = 42,899.73 : x
2. Step 2: Convert to fraction form
   78,707.40/108,618.58 = 42,899.73/x
3. Step 3: Cross multiply
   78,707.40x = 108,618.58 × 42,899.73
4. Step 4: Simplify right side
   78,707.40x = 4,659,707,808.61
5. Step 5: Solve for x
   x = 4,659,707,808.61/78,707.40
6. Step 6: Final answer
   x = 59,202.92