Finding the Fourth Proportional to 126,553.89, 174,638.83 and 72,840.63

Step by Step Solution

1. Step 1: Write the proportion equation
   126,553.89 : 174,638.83 = 72,840.63 : x
2. Step 2: Convert to fraction form
   126,553.89/174,638.83 = 72,840.63/x
3. Step 3: Cross multiply
   126,553.89x = 174,638.83 × 72,840.63
4. Step 4: Simplify right side
   126,553.89x = 12,720,802,399.66
5. Step 5: Solve for x
   x = 12,720,802,399.66/126,553.89
6. Step 6: Final answer
   x = 100,516.88