Finding the Third Proportional to 417,215 and 856,547.50

Step by Step Solution

1. Step 1: Write the proportion equation
   417,215 : 856,547.50 = 856,547.50 : x
2. Step 2: Convert to fraction form
   417,215/856,547.50 = 856,547.50/x
3. Step 3: Cross multiply
   417,215x = 856,547.50 × 856,547.50
4. Step 4: Simplify right side
   417,215x = 733,673,619,756.25
5. Step 5: Solve for x
   x = 733,673,619,756.25/417,215
6. Step 6: Final answer
   x = 1,758,502.50