Finding the Fourth Proportional to 78,031.92, 107,683.46 and 42,221.82

Step by Step Solution

1. Step 1: Write the proportion equation
   78,031.92 : 107,683.46 = 42,221.82 : x
2. Step 2: Convert to fraction form
   78,031.92/107,683.46 = 42,221.82/x
3. Step 3: Cross multiply
   78,031.92x = 107,683.46 × 42,221.82
4. Step 4: Simplify right side
   78,031.92x = 4,546,591,665.10
5. Step 5: Solve for x
   x = 4,546,591,665.10/78,031.92
6. Step 6: Final answer
   x = 58,265.79