Finding the Third Proportional to 1,212.19 and 1,816.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.19 : 1,816.59 = 1,816.59 : x
2. Step 2: Convert to fraction form
   1,212.19/1,816.59 = 1,816.59/x
3. Step 3: Cross multiply
   1,212.19x = 1,816.59 × 1,816.59
4. Step 4: Simplify right side
   1,212.19x = 3,300,012.85
5. Step 5: Solve for x
   x = 3,300,012.85/1,212.19
6. Step 6: Final answer
   x = 2,722.36