Finding the Fourth Proportional to 126,638.79, 174,771 and 72,192.25

Step by Step Solution

1. Step 1: Write the proportion equation
   126,638.79 : 174,771 = 72,192.25 : x
2. Step 2: Convert to fraction form
   126,638.79/174,771 = 72,192.25/x
3. Step 3: Cross multiply
   126,638.79x = 174,771 × 72,192.25
4. Step 4: Simplify right side
   126,638.79x = 12,617,111,724.75
5. Step 5: Solve for x
   x = 12,617,111,724.75/126,638.79
6. Step 6: Final answer
   x = 99,630.70