Finding the Fourth Proportional to 78,680.35, 108,577.47 and 42,870.61

Step by Step Solution

1. Step 1: Write the proportion equation
   78,680.35 : 108,577.47 = 42,870.61 : x
2. Step 2: Convert to fraction form
   78,680.35/108,577.47 = 42,870.61/x
3. Step 3: Cross multiply
   78,680.35x = 108,577.47 × 42,870.61
4. Step 4: Simplify right side
   78,680.35x = 4,654,782,371.16
5. Step 5: Solve for x
   x = 4,654,782,371.16/78,680.35
6. Step 6: Final answer
   x = 59,160.67