Finding the Third Proportional to 721,140 and 1,538,800.50

Step by Step Solution

1. Step 1: Write the proportion equation
   721,140 : 1,538,800.50 = 1,538,800.50 : x
2. Step 2: Convert to fraction form
   721,140/1,538,800.50 = 1,538,800.50/x
3. Step 3: Cross multiply
   721,140x = 1,538,800.50 × 1,538,800.50
4. Step 4: Simplify right side
   721,140x = 2,367,906,978,800.25
5. Step 5: Solve for x
   x = 2,367,906,978,800.25/721,140
6. Step 6: Final answer
   x = 3,283,560.72