Finding the Fourth Proportional to 1,515.51, 2,091.33 and 886.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,515.51 : 2,091.33 = 886.10 : x
2. Step 2: Convert to fraction form
   1,515.51/2,091.33 = 886.10/x
3. Step 3: Cross multiply
   1,515.51x = 2,091.33 × 886.10
4. Step 4: Simplify right side
   1,515.51x = 1,853,117.06
5. Step 5: Solve for x
   x = 1,853,117.06/1,515.51
6. Step 6: Final answer
   x = 1,222.77