Finding the Third Proportional to 399,120 and 602,824.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,120 : 602,824.50 = 602,824.50 : x
2. Step 2: Convert to fraction form
   399,120/602,824.50 = 602,824.50/x
3. Step 3: Cross multiply
   399,120x = 602,824.50 × 602,824.50
4. Step 4: Simplify right side
   399,120x = 363,397,377,800.25
5. Step 5: Solve for x
   x = 363,397,377,800.25/399,120
6. Step 6: Final answer
   x = 910,496.54