Finding the Fourth Proportional to 78,031.88, 107,683.22 and 42,221.10

Step by Step Solution

1. Step 1: Write the proportion equation
   78,031.88 : 107,683.22 = 42,221.10 : x
2. Step 2: Convert to fraction form
   78,031.88/107,683.22 = 42,221.10/x
3. Step 3: Cross multiply
   78,031.88x = 107,683.22 × 42,221.10
4. Step 4: Simplify right side
   78,031.88x = 4,546,503,788.84
5. Step 5: Solve for x
   x = 4,546,503,788.84/78,031.88
6. Step 6: Final answer
   x = 58,264.70