Finding the Third Proportional to 638,730.50 and 1,390,861

Step by Step Solution

1. Step 1: Write the proportion equation
   638,730.50 : 1,390,861 = 1,390,861 : x
2. Step 2: Convert to fraction form
   638,730.50/1,390,861 = 1,390,861/x
3. Step 3: Cross multiply
   638,730.50x = 1,390,861 × 1,390,861
4. Step 4: Simplify right side
   638,730.50x = 1,934,494,321,321
5. Step 5: Solve for x
   x = 1,934,494,321,321/638,730.50
6. Step 6: Final answer
   x = 3,028,655.00