Finding the Fourth Proportional to 165,086.64, 247,505.76 and 80,820.72

Step by Step Solution

1. Step 1: Write the proportion equation
   165,086.64 : 247,505.76 = 80,820.72 : x
2. Step 2: Convert to fraction form
   165,086.64/247,505.76 = 80,820.72/x
3. Step 3: Cross multiply
   165,086.64x = 247,505.76 × 80,820.72
4. Step 4: Simplify right side
   165,086.64x = 20,003,593,727.35
5. Step 5: Solve for x
   x = 20,003,593,727.35/165,086.64
6. Step 6: Final answer
   x = 121,170.28