Finding the Fourth Proportional to 126,298.63, 174,501.30 and 99,643.96

Step by Step Solution

1. Step 1: Write the proportion equation
   126,298.63 : 174,501.30 = 99,643.96 : x
2. Step 2: Convert to fraction form
   126,298.63/174,501.30 = 99,643.96/x
3. Step 3: Cross multiply
   126,298.63x = 174,501.30 × 99,643.96
4. Step 4: Simplify right side
   126,298.63x = 17,388,000,557.15
5. Step 5: Solve for x
   x = 17,388,000,557.15/126,298.63
6. Step 6: Final answer
   x = 137,673.71