Finding the Third Proportional to 390,847.50 and 856,512

Step by Step Solution

1. Step 1: Write the proportion equation
   390,847.50 : 856,512 = 856,512 : x
2. Step 2: Convert to fraction form
   390,847.50/856,512 = 856,512/x
3. Step 3: Cross multiply
   390,847.50x = 856,512 × 856,512
4. Step 4: Simplify right side
   390,847.50x = 733,612,806,144
5. Step 5: Solve for x
   x = 733,612,806,144/390,847.50
6. Step 6: Final answer
   x = 1,876,979.66