Finding the Fourth Proportional to 78,493.80, 108,323.49 and 42,685.90

Step by Step Solution

1. Step 1: Write the proportion equation
   78,493.80 : 108,323.49 = 42,685.90 : x
2. Step 2: Convert to fraction form
   78,493.80/108,323.49 = 42,685.90/x
3. Step 3: Cross multiply
   78,493.80x = 108,323.49 × 42,685.90
4. Step 4: Simplify right side
   78,493.80x = 4,623,885,661.79
5. Step 5: Solve for x
   x = 4,623,885,661.79/78,493.80
6. Step 6: Final answer
   x = 58,907.65