Finding the Third Proportional to 398,908.50 and 864,276

Step by Step Solution

1. Step 1: Write the proportion equation
   398,908.50 : 864,276 = 864,276 : x
2. Step 2: Convert to fraction form
   398,908.50/864,276 = 864,276/x
3. Step 3: Cross multiply
   398,908.50x = 864,276 × 864,276
4. Step 4: Simplify right side
   398,908.50x = 746,973,004,176
5. Step 5: Solve for x
   x = 746,973,004,176/398,908.50
6. Step 6: Final answer
   x = 1,872,542.21