Finding the Third Proportional to 415,371 and 645,088.50

Step by Step Solution

1. Step 1: Write the proportion equation
   415,371 : 645,088.50 = 645,088.50 : x
2. Step 2: Convert to fraction form
   415,371/645,088.50 = 645,088.50/x
3. Step 3: Cross multiply
   415,371x = 645,088.50 × 645,088.50
4. Step 4: Simplify right side
   415,371x = 416,139,172,832.25
5. Step 5: Solve for x
   x = 416,139,172,832.25/415,371
6. Step 6: Final answer
   x = 1,001,849.37