Finding the Fourth Proportional to 78,429.97, 108,230.38 and 42,619.20

Step by Step Solution

1. Step 1: Write the proportion equation
   78,429.97 : 108,230.38 = 42,619.20 : x
2. Step 2: Convert to fraction form
   78,429.97/108,230.38 = 42,619.20/x
3. Step 3: Cross multiply
   78,429.97x = 108,230.38 × 42,619.20
4. Step 4: Simplify right side
   78,429.97x = 4,612,692,211.30
5. Step 5: Solve for x
   x = 4,612,692,211.30/78,429.97
6. Step 6: Final answer
   x = 58,812.88