Finding the Fourth Proportional to 2,780.16, 3,836.72 and 1,521.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,780.16 : 3,836.72 = 1,521.18 : x
2. Step 2: Convert to fraction form
   2,780.16/3,836.72 = 1,521.18/x
3. Step 3: Cross multiply
   2,780.16x = 3,836.72 × 1,521.18
4. Step 4: Simplify right side
   2,780.16x = 5,836,345.53
5. Step 5: Solve for x
   x = 5,836,345.53/2,780.16
6. Step 6: Final answer
   x = 2,099.29