Finding the Fourth Proportional to 78,640.31, 108,524.88 and 42,830.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,640.31 : 108,524.88 = 42,830.30 : x
2. Step 2: Convert to fraction form
   78,640.31/108,524.88 = 42,830.30/x
3. Step 3: Cross multiply
   78,640.31x = 108,524.88 × 42,830.30
4. Step 4: Simplify right side
   78,640.31x = 4,648,153,439.18
5. Step 5: Solve for x
   x = 4,648,153,439.18/78,640.31
6. Step 6: Final answer
   x = 59,106.50