Finding the Third Proportional to 109,456.31 and 139,861.69

Step by Step Solution

1. Step 1: Write the proportion equation
   109,456.31 : 139,861.69 = 139,861.69 : x
2. Step 2: Convert to fraction form
   109,456.31/139,861.69 = 139,861.69/x
3. Step 3: Cross multiply
   109,456.31x = 139,861.69 × 139,861.69
4. Step 4: Simplify right side
   109,456.31x = 19,561,291,630.35
5. Step 5: Solve for x
   x = 19,561,291,630.35/109,456.31
6. Step 6: Final answer
   x = 178,713.23