Finding the Third Proportional to 407,491.50 and 645,102

Step by Step Solution

1. Step 1: Write the proportion equation
   407,491.50 : 645,102 = 645,102 : x
2. Step 2: Convert to fraction form
   407,491.50/645,102 = 645,102/x
3. Step 3: Cross multiply
   407,491.50x = 645,102 × 645,102
4. Step 4: Simplify right side
   407,491.50x = 416,156,590,404
5. Step 5: Solve for x
   x = 416,156,590,404/407,491.50
6. Step 6: Final answer
   x = 1,021,264.47