Finding the Third Proportional to 336,989 and 721,362.50

Step by Step Solution

1. Step 1: Write the proportion equation
   336,989 : 721,362.50 = 721,362.50 : x
2. Step 2: Convert to fraction form
   336,989/721,362.50 = 721,362.50/x
3. Step 3: Cross multiply
   336,989x = 721,362.50 × 721,362.50
4. Step 4: Simplify right side
   336,989x = 520,363,856,406.25
5. Step 5: Solve for x
   x = 520,363,856,406.25/336,989
6. Step 6: Final answer
   x = 1,544,156.80