Finding the Fourth Proportional to 2,780.47, 3,836.91 and 1,521.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,780.47 : 3,836.91 = 1,521.28 : x
2. Step 2: Convert to fraction form
   2,780.47/3,836.91 = 1,521.28/x
3. Step 3: Cross multiply
   2,780.47x = 3,836.91 × 1,521.28
4. Step 4: Simplify right side
   2,780.47x = 5,837,026.19
5. Step 5: Solve for x
   x = 5,837,026.19/2,780.47
6. Step 6: Final answer
   x = 2,099.29