Finding the Third Proportional to 523,639 and 805,870.50

Step by Step Solution

1. Step 1: Write the proportion equation
   523,639 : 805,870.50 = 805,870.50 : x
2. Step 2: Convert to fraction form
   523,639/805,870.50 = 805,870.50/x
3. Step 3: Cross multiply
   523,639x = 805,870.50 × 805,870.50
4. Step 4: Simplify right side
   523,639x = 649,427,262,770.25
5. Step 5: Solve for x
   x = 649,427,262,770.25/523,639
6. Step 6: Final answer
   x = 1,240,219.43