Finding the Fourth Proportional to 123,648.50, 185,472.46 and 81,221.74

Step by Step Solution

1. Step 1: Write the proportion equation
   123,648.50 : 185,472.46 = 81,221.74 : x
2. Step 2: Convert to fraction form
   123,648.50/185,472.46 = 81,221.74/x
3. Step 3: Cross multiply
   123,648.50x = 185,472.46 × 81,221.74
4. Step 4: Simplify right side
   123,648.50x = 15,064,395,675.34
5. Step 5: Solve for x
   x = 15,064,395,675.34/123,648.50
6. Step 6: Final answer
   x = 121,832.42