Finding the Third Proportional to 128,362 and 286,238.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,362 : 286,238.50 = 286,238.50 : x
2. Step 2: Convert to fraction form
   128,362/286,238.50 = 286,238.50/x
3. Step 3: Cross multiply
   128,362x = 286,238.50 × 286,238.50
4. Step 4: Simplify right side
   128,362x = 81,932,478,882.25
5. Step 5: Solve for x
   x = 81,932,478,882.25/128,362
6. Step 6: Final answer
   x = 638,292.32