Finding the Third Proportional to 1,139.91 and 2,521.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.91 : 2,521.55 = 2,521.55 : x
2. Step 2: Convert to fraction form
   1,139.91/2,521.55 = 2,521.55/x
3. Step 3: Cross multiply
   1,139.91x = 2,521.55 × 2,521.55
4. Step 4: Simplify right side
   1,139.91x = 6,358,198.64
5. Step 5: Solve for x
   x = 6,358,198.64/1,139.91
6. Step 6: Final answer
   x = 5,577.83