Finding the Third Proportional to 721,279 and 1,558,172

Step by Step Solution

1. Step 1: Write the proportion equation
   721,279 : 1,558,172 = 1,558,172 : x
2. Step 2: Convert to fraction form
   721,279/1,558,172 = 1,558,172/x
3. Step 3: Cross multiply
   721,279x = 1,558,172 × 1,558,172
4. Step 4: Simplify right side
   721,279x = 2,427,899,981,584
5. Step 5: Solve for x
   x = 2,427,899,981,584/721,279
6. Step 6: Final answer
   x = 3,366,103.80