Finding the Third Proportional to 987.19 and 2,111.06

Step by Step Solution

1. Step 1: Write the proportion equation
   987.19 : 2,111.06 = 2,111.06 : x
2. Step 2: Convert to fraction form
   987.19/2,111.06 = 2,111.06/x
3. Step 3: Cross multiply
   987.19x = 2,111.06 × 2,111.06
4. Step 4: Simplify right side
   987.19x = 4,456,584.88
5. Step 5: Solve for x
   x = 4,456,584.88/987.19
6. Step 6: Final answer
   x = 4,514.43