Finding the Third Proportional to 1,139.91 and 1,816.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.91 : 1,816.17 = 1,816.17 : x
2. Step 2: Convert to fraction form
   1,139.91/1,816.17 = 1,816.17/x
3. Step 3: Cross multiply
   1,139.91x = 1,816.17 × 1,816.17
4. Step 4: Simplify right side
   1,139.91x = 3,298,480.28
5. Step 5: Solve for x
   x = 3,298,480.28/1,139.91
6. Step 6: Final answer
   x = 2,893.64