Finding the Third Proportional to 392,216.50 and 552,315

Step by Step Solution

1. Step 1: Write the proportion equation
   392,216.50 : 552,315 = 552,315 : x
2. Step 2: Convert to fraction form
   392,216.50/552,315 = 552,315/x
3. Step 3: Cross multiply
   392,216.50x = 552,315 × 552,315
4. Step 4: Simplify right side
   392,216.50x = 305,051,859,225
5. Step 5: Solve for x
   x = 305,051,859,225/392,216.50
6. Step 6: Final answer
   x = 777,763.96