Finding the Third Proportional to 645,928.17 and 1,390,567.50

Step by Step Solution

1. Step 1: Write the proportion equation
   645,928.17 : 1,390,567.50 = 1,390,567.50 : x
2. Step 2: Convert to fraction form
   645,928.17/1,390,567.50 = 1,390,567.50/x
3. Step 3: Cross multiply
   645,928.17x = 1,390,567.50 × 1,390,567.50
4. Step 4: Simplify right side
   645,928.17x = 1,933,677,972,056.25
5. Step 5: Solve for x
   x = 1,933,677,972,056.25/645,928.17
6. Step 6: Final answer
   x = 2,993,642.41