Finding the Fourth Proportional to 2,640.09, 3,642.45 and 1,521.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.09 : 3,642.45 = 1,521.01 : x
2. Step 2: Convert to fraction form
   2,640.09/3,642.45 = 1,521.01/x
3. Step 3: Cross multiply
   2,640.09x = 3,642.45 × 1,521.01
4. Step 4: Simplify right side
   2,640.09x = 5,540,201.72
5. Step 5: Solve for x
   x = 5,540,201.72/2,640.09
6. Step 6: Final answer
   x = 2,098.49