Finding the Fourth Proportional to 126,018.74, 173,904.50 and 72,312.21

Step by Step Solution

1. Step 1: Write the proportion equation
   126,018.74 : 173,904.50 = 72,312.21 : x
2. Step 2: Convert to fraction form
   126,018.74/173,904.50 = 72,312.21/x
3. Step 3: Cross multiply
   126,018.74x = 173,904.50 × 72,312.21
4. Step 4: Simplify right side
   126,018.74x = 12,575,418,362.38
5. Step 5: Solve for x
   x = 12,575,418,362.38/126,018.74
6. Step 6: Final answer
   x = 99,790.07