Finding the Fourth Proportional to 109,131.16, 163,663.84 and 71,689.72

Step by Step Solution

1. Step 1: Write the proportion equation
   109,131.16 : 163,663.84 = 71,689.72 : x
2. Step 2: Convert to fraction form
   109,131.16/163,663.84 = 71,689.72/x
3. Step 3: Cross multiply
   109,131.16x = 163,663.84 × 71,689.72
4. Step 4: Simplify right side
   109,131.16x = 11,733,014,863.72
5. Step 5: Solve for x
   x = 11,733,014,863.72/109,131.16
6. Step 6: Final answer
   x = 107,512.97