Finding the Fourth Proportional to 78,031.58, 107,683.56 and 42,221.61

Step by Step Solution

1. Step 1: Write the proportion equation
   78,031.58 : 107,683.56 = 42,221.61 : x
2. Step 2: Convert to fraction form
   78,031.58/107,683.56 = 42,221.61/x
3. Step 3: Cross multiply
   78,031.58x = 107,683.56 × 42,221.61
4. Step 4: Simplify right side
   78,031.58x = 4,546,573,273.73
5. Step 5: Solve for x
   x = 4,546,573,273.73/78,031.58
6. Step 6: Final answer
   x = 58,265.81