Finding the Third Proportional to 1,056.09 and 1,221.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.09 : 1,221.19 = 1,221.19 : x
2. Step 2: Convert to fraction form
   1,056.09/1,221.19 = 1,221.19/x
3. Step 3: Cross multiply
   1,056.09x = 1,221.19 × 1,221.19
4. Step 4: Simplify right side
   1,056.09x = 1,491,298.91
5. Step 5: Solve for x
   x = 1,491,298.91/1,056.09
6. Step 6: Final answer
   x = 1,412.09