Finding the Third Proportional to 280,617 and 615,562.50

Step by Step Solution

1. Step 1: Write the proportion equation
   280,617 : 615,562.50 = 615,562.50 : x
2. Step 2: Convert to fraction form
   280,617/615,562.50 = 615,562.50/x
3. Step 3: Cross multiply
   280,617x = 615,562.50 × 615,562.50
4. Step 4: Simplify right side
   280,617x = 378,917,191,406.25
5. Step 5: Solve for x
   x = 378,917,191,406.25/280,617
6. Step 6: Final answer
   x = 1,350,300.20