Finding the Third Proportional to 728,080 and 1,139,658

Step by Step Solution

1. Step 1: Write the proportion equation
   728,080 : 1,139,658 = 1,139,658 : x
2. Step 2: Convert to fraction form
   728,080/1,139,658 = 1,139,658/x
3. Step 3: Cross multiply
   728,080x = 1,139,658 × 1,139,658
4. Step 4: Simplify right side
   728,080x = 1,298,820,356,964
5. Step 5: Solve for x
   x = 1,298,820,356,964/728,080
6. Step 6: Final answer
   x = 1,783,897.86