Finding the Third Proportional to 1,417.50 and 2,139.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.50 : 2,139.75 = 2,139.75 : x
2. Step 2: Convert to fraction form
   1,417.50/2,139.75 = 2,139.75/x
3. Step 3: Cross multiply
   1,417.50x = 2,139.75 × 2,139.75
4. Step 4: Simplify right side
   1,417.50x = 4,578,530.06
5. Step 5: Solve for x
   x = 4,578,530.06/1,417.50
6. Step 6: Final answer
   x = 3,230.00