Finding the Third Proportional to 245,612.50 and 390,560

Step by Step Solution

1. Step 1: Write the proportion equation
   245,612.50 : 390,560 = 390,560 : x
2. Step 2: Convert to fraction form
   245,612.50/390,560 = 390,560/x
3. Step 3: Cross multiply
   245,612.50x = 390,560 × 390,560
4. Step 4: Simplify right side
   245,612.50x = 152,537,113,600
5. Step 5: Solve for x
   x = 152,537,113,600/245,612.50
6. Step 6: Final answer
   x = 621,047.84