Finding the Third Proportional to 1,399.78 and 2,059.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.78 : 2,059.17 = 2,059.17 : x
2. Step 2: Convert to fraction form
   1,399.78/2,059.17 = 2,059.17/x
3. Step 3: Cross multiply
   1,399.78x = 2,059.17 × 2,059.17
4. Step 4: Simplify right side
   1,399.78x = 4,240,188.81
5. Step 5: Solve for x
   x = 4,240,188.81/1,399.78
6. Step 6: Final answer
   x = 3,029.18