Finding the Third Proportional to 258,719.50 and 392,453

Step by Step Solution

1. Step 1: Write the proportion equation
   258,719.50 : 392,453 = 392,453 : x
2. Step 2: Convert to fraction form
   258,719.50/392,453 = 392,453/x
3. Step 3: Cross multiply
   258,719.50x = 392,453 × 392,453
4. Step 4: Simplify right side
   258,719.50x = 154,019,357,209
5. Step 5: Solve for x
   x = 154,019,357,209/258,719.50
6. Step 6: Final answer
   x = 595,314.06