Finding the Fourth Proportional to 78,681.71, 108,581.55 and 42,872.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,681.71 : 108,581.55 = 42,872.31 : x
2. Step 2: Convert to fraction form
   78,681.71/108,581.55 = 42,872.31/x
3. Step 3: Cross multiply
   78,681.71x = 108,581.55 × 42,872.31
4. Step 4: Simplify right side
   78,681.71x = 4,655,141,871.88
5. Step 5: Solve for x
   x = 4,655,141,871.88/78,681.71
6. Step 6: Final answer
   x = 59,164.22