Finding the Third Proportional to 721,142 and 1,538,805

Step by Step Solution

1. Step 1: Write the proportion equation
   721,142 : 1,538,805 = 1,538,805 : x
2. Step 2: Convert to fraction form
   721,142/1,538,805 = 1,538,805/x
3. Step 3: Cross multiply
   721,142x = 1,538,805 × 1,538,805
4. Step 4: Simplify right side
   721,142x = 2,367,920,828,025
5. Step 5: Solve for x
   x = 2,367,920,828,025/721,142
6. Step 6: Final answer
   x = 3,283,570.82