Finding the Third Proportional to 721,216 and 1,121,142

Step by Step Solution

1. Step 1: Write the proportion equation
   721,216 : 1,121,142 = 1,121,142 : x
2. Step 2: Convert to fraction form
   721,216/1,121,142 = 1,121,142/x
3. Step 3: Cross multiply
   721,216x = 1,121,142 × 1,121,142
4. Step 4: Simplify right side
   721,216x = 1,256,959,384,164
5. Step 5: Solve for x
   x = 1,256,959,384,164/721,216
6. Step 6: Final answer
   x = 1,742,833.47