Finding the Third Proportional to 390,406.50 and 850,068

Step by Step Solution

1. Step 1: Write the proportion equation
   390,406.50 : 850,068 = 850,068 : x
2. Step 2: Convert to fraction form
   390,406.50/850,068 = 850,068/x
3. Step 3: Cross multiply
   390,406.50x = 850,068 × 850,068
4. Step 4: Simplify right side
   390,406.50x = 722,615,604,624
5. Step 5: Solve for x
   x = 722,615,604,624/390,406.50
6. Step 6: Final answer
   x = 1,850,931.28