Finding the Third Proportional to 117,129.50 and 256,831

Step by Step Solution

1. Step 1: Write the proportion equation
   117,129.50 : 256,831 = 256,831 : x
2. Step 2: Convert to fraction form
   117,129.50/256,831 = 256,831/x
3. Step 3: Cross multiply
   117,129.50x = 256,831 × 256,831
4. Step 4: Simplify right side
   117,129.50x = 65,962,162,561
5. Step 5: Solve for x
   x = 65,962,162,561/117,129.50
6. Step 6: Final answer
   x = 563,155.85