Finding the Fourth Proportional to 78,685.16, 108,585.54 and 42,875.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78,685.16 : 108,585.54 = 42,875.18 : x
2. Step 2: Convert to fraction form
   78,685.16/108,585.54 = 42,875.18/x
3. Step 3: Cross multiply
   78,685.16x = 108,585.54 × 42,875.18
4. Step 4: Simplify right side
   78,685.16x = 4,655,624,029.97
5. Step 5: Solve for x
   x = 4,655,624,029.97/78,685.16
6. Step 6: Final answer
   x = 59,167.76