Finding the Third Proportional to 155,990.25 and 246,789

Step by Step Solution

1. Step 1: Write the proportion equation
   155,990.25 : 246,789 = 246,789 : x
2. Step 2: Convert to fraction form
   155,990.25/246,789 = 246,789/x
3. Step 3: Cross multiply
   155,990.25x = 246,789 × 246,789
4. Step 4: Simplify right side
   155,990.25x = 60,904,810,521
5. Step 5: Solve for x
   x = 60,904,810,521/155,990.25
6. Step 6: Final answer
   x = 390,439.85