Finding the Third Proportional to 128,731.50 and 269,233.88

Step by Step Solution

1. Step 1: Write the proportion equation
   128,731.50 : 269,233.88 = 269,233.88 : x
2. Step 2: Convert to fraction form
   128,731.50/269,233.88 = 269,233.88/x
3. Step 3: Cross multiply
   128,731.50x = 269,233.88 × 269,233.88
4. Step 4: Simplify right side
   128,731.50x = 72,486,879,447.52
5. Step 5: Solve for x
   x = 72,486,879,447.52/128,731.50
6. Step 6: Final answer
   x = 563,085.80