Finding the Third Proportional to 250,551 and 387,490.50

Step by Step Solution

1. Step 1: Write the proportion equation
   250,551 : 387,490.50 = 387,490.50 : x
2. Step 2: Convert to fraction form
   250,551/387,490.50 = 387,490.50/x
3. Step 3: Cross multiply
   250,551x = 387,490.50 × 387,490.50
4. Step 4: Simplify right side
   250,551x = 150,148,887,590.25
5. Step 5: Solve for x
   x = 150,148,887,590.25/250,551
6. Step 6: Final answer
   x = 599,274.75