Finding the Third Proportional to 399,468 and 607,380

Step by Step Solution

1. Step 1: Write the proportion equation
   399,468 : 607,380 = 607,380 : x
2. Step 2: Convert to fraction form
   399,468/607,380 = 607,380/x
3. Step 3: Cross multiply
   399,468x = 607,380 × 607,380
4. Step 4: Simplify right side
   399,468x = 368,910,464,400
5. Step 5: Solve for x
   x = 368,910,464,400/399,468
6. Step 6: Final answer
   x = 923,504.42