Finding the Fourth Proportional to 109,720.64, 163,617.52 and 108,722.72

Step by Step Solution

1. Step 1: Write the proportion equation
   109,720.64 : 163,617.52 = 108,722.72 : x
2. Step 2: Convert to fraction form
   109,720.64/163,617.52 = 108,722.72/x
3. Step 3: Cross multiply
   109,720.64x = 163,617.52 × 108,722.72
4. Step 4: Simplify right side
   109,720.64x = 17,788,941,814.05
5. Step 5: Solve for x
   x = 17,788,941,814.05/109,720.64
6. Step 6: Final answer
   x = 162,129.40