Finding the Fourth Proportional to 78,617.50, 108,490.53 and 42,808.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,617.50 : 108,490.53 = 42,808.18 : x
2. Step 2: Convert to fraction form
   78,617.50/108,490.53 = 42,808.18/x
3. Step 3: Cross multiply
   78,617.50x = 108,490.53 × 42,808.18
4. Step 4: Simplify right side
   78,617.50x = 4,644,282,136.54
5. Step 5: Solve for x
   x = 4,644,282,136.54/78,617.50
6. Step 6: Final answer
   x = 59,074.41