Finding the Fourth Proportional to 2,516.78, 3,472.61 and 1,521.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,516.78 : 3,472.61 = 1,521.86 : x
2. Step 2: Convert to fraction form
   2,516.78/3,472.61 = 1,521.86/x
3. Step 3: Cross multiply
   2,516.78x = 3,472.61 × 1,521.86
4. Step 4: Simplify right side
   2,516.78x = 5,284,801.28
5. Step 5: Solve for x
   x = 5,284,801.28/2,516.78
6. Step 6: Final answer
   x = 2,099.82