Finding the Fourth Proportional to 78,684.42, 108,585.09 and 42,875.40

Step by Step Solution

1. Step 1: Write the proportion equation
   78,684.42 : 108,585.09 = 42,875.40 : x
2. Step 2: Convert to fraction form
   78,684.42/108,585.09 = 42,875.40/x
3. Step 3: Cross multiply
   78,684.42x = 108,585.09 × 42,875.40
4. Step 4: Simplify right side
   78,684.42x = 4,655,629,167.79
5. Step 5: Solve for x
   x = 4,655,629,167.79/78,684.42
6. Step 6: Final answer
   x = 59,168.37