Finding the Fourth Proportional to 2,515.29, 3,769.74 and 1,128.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,515.29 : 3,769.74 = 1,128.57 : x
2. Step 2: Convert to fraction form
   2,515.29/3,769.74 = 1,128.57/x
3. Step 3: Cross multiply
   2,515.29x = 3,769.74 × 1,128.57
4. Step 4: Simplify right side
   2,515.29x = 4,254,415.47
5. Step 5: Solve for x
   x = 4,254,415.47/2,515.29
6. Step 6: Final answer
   x = 1,691.42