Finding the Third Proportional to 728,410 and 1,140,139

Step by Step Solution

1. Step 1: Write the proportion equation
   728,410 : 1,140,139 = 1,140,139 : x
2. Step 2: Convert to fraction form
   728,410/1,140,139 = 1,140,139/x
3. Step 3: Cross multiply
   728,410x = 1,140,139 × 1,140,139
4. Step 4: Simplify right side
   728,410x = 1,299,916,939,321
5. Step 5: Solve for x
   x = 1,299,916,939,321/728,410
6. Step 6: Final answer
   x = 1,784,595.13