Finding the Third Proportional to 423,661.50 and 645,417

Step by Step Solution

1. Step 1: Write the proportion equation
   423,661.50 : 645,417 = 645,417 : x
2. Step 2: Convert to fraction form
   423,661.50/645,417 = 645,417/x
3. Step 3: Cross multiply
   423,661.50x = 645,417 × 645,417
4. Step 4: Simplify right side
   423,661.50x = 416,563,103,889
5. Step 5: Solve for x
   x = 416,563,103,889/423,661.50
6. Step 6: Final answer
   x = 983,245.12