Finding the Third Proportional to 390,447 and 791,761.50

Step by Step Solution

1. Step 1: Write the proportion equation
   390,447 : 791,761.50 = 791,761.50 : x
2. Step 2: Convert to fraction form
   390,447/791,761.50 = 791,761.50/x
3. Step 3: Cross multiply
   390,447x = 791,761.50 × 791,761.50
4. Step 4: Simplify right side
   390,447x = 626,886,272,882.25
5. Step 5: Solve for x
   x = 626,886,272,882.25/390,447
6. Step 6: Final answer
   x = 1,605,560.48