Finding the Third Proportional to 250,816.50 and 392,870.25

Step by Step Solution

1. Step 1: Write the proportion equation
   250,816.50 : 392,870.25 = 392,870.25 : x
2. Step 2: Convert to fraction form
   250,816.50/392,870.25 = 392,870.25/x
3. Step 3: Cross multiply
   250,816.50x = 392,870.25 × 392,870.25
4. Step 4: Simplify right side
   250,816.50x = 154,347,033,335.06
5. Step 5: Solve for x
   x = 154,347,033,335.06/250,816.50
6. Step 6: Final answer
   x = 615,378.31