Finding the Fourth Proportional to 78,031.25, 107,683.17 and 42,221.17

Step by Step Solution

1. Step 1: Write the proportion equation
   78,031.25 : 107,683.17 = 42,221.17 : x
2. Step 2: Convert to fraction form
   78,031.25/107,683.17 = 42,221.17/x
3. Step 3: Cross multiply
   78,031.25x = 107,683.17 × 42,221.17
4. Step 4: Simplify right side
   78,031.25x = 4,546,509,943.34
5. Step 5: Solve for x
   x = 4,546,509,943.34/78,031.25
6. Step 6: Final answer
   x = 58,265.25