Finding the Third Proportional to 243,137.25 and 390,654

Step by Step Solution

1. Step 1: Write the proportion equation
   243,137.25 : 390,654 = 390,654 : x
2. Step 2: Convert to fraction form
   243,137.25/390,654 = 390,654/x
3. Step 3: Cross multiply
   243,137.25x = 390,654 × 390,654
4. Step 4: Simplify right side
   243,137.25x = 152,610,547,716
5. Step 5: Solve for x
   x = 152,610,547,716/243,137.25
6. Step 6: Final answer
   x = 627,672.43