Finding the Third Proportional to 390,844.50 and 856,506

Step by Step Solution

1. Step 1: Write the proportion equation
   390,844.50 : 856,506 = 856,506 : x
2. Step 2: Convert to fraction form
   390,844.50/856,506 = 856,506/x
3. Step 3: Cross multiply
   390,844.50x = 856,506 × 856,506
4. Step 4: Simplify right side
   390,844.50x = 733,602,528,036
5. Step 5: Solve for x
   x = 733,602,528,036/390,844.50
6. Step 6: Final answer
   x = 1,876,967.77