Finding the Third Proportional to 2,485.88 and 5,418.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.88 : 5,418.38 = 5,418.38 : x
2. Step 2: Convert to fraction form
   2,485.88/5,418.38 = 5,418.38/x
3. Step 3: Cross multiply
   2,485.88x = 5,418.38 × 5,418.38
4. Step 4: Simplify right side
   2,485.88x = 29,358,787.64
5. Step 5: Solve for x
   x = 29,358,787.64/2,485.88
6. Step 6: Final answer
   x = 11,810.24