Finding the Fourth Proportional to 126,742.78, 174,925.42 and 72,312.72

Step by Step Solution

1. Step 1: Write the proportion equation
   126,742.78 : 174,925.42 = 72,312.72 : x
2. Step 2: Convert to fraction form
   126,742.78/174,925.42 = 72,312.72/x
3. Step 3: Cross multiply
   126,742.78x = 174,925.42 × 72,312.72
4. Step 4: Simplify right side
   126,742.78x = 12,649,332,917.34
5. Step 5: Solve for x
   x = 12,649,332,917.34/126,742.78
6. Step 6: Final answer
   x = 99,803.18