Finding the Fourth Proportional to 126,738.38, 174,899.12 and 78,991.69

Step by Step Solution

1. Step 1: Write the proportion equation
   126,738.38 : 174,899.12 = 78,991.69 : x
2. Step 2: Convert to fraction form
   126,738.38/174,899.12 = 78,991.69/x
3. Step 3: Cross multiply
   126,738.38x = 174,899.12 × 78,991.69
4. Step 4: Simplify right side
   126,738.38x = 13,815,576,828.54
5. Step 5: Solve for x
   x = 13,815,576,828.54/126,738.38
6. Step 6: Final answer
   x = 109,008.63