Finding the Third Proportional to 645,856.88 and 1,390,435.88

Step by Step Solution

1. Step 1: Write the proportion equation
   645,856.88 : 1,390,435.88 = 1,390,435.88 : x
2. Step 2: Convert to fraction form
   645,856.88/1,390,435.88 = 1,390,435.88/x
3. Step 3: Cross multiply
   645,856.88x = 1,390,435.88 × 1,390,435.88
4. Step 4: Simplify right side
   645,856.88x = 1,933,311,922,487.02
5. Step 5: Solve for x
   x = 1,933,311,922,487.02/645,856.88
6. Step 6: Final answer
   x = 2,993,406.12