Finding the Fourth Proportional to 2,091.40, 2,886.15 and 1,147.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.40 : 2,886.15 = 1,147.18 : x
2. Step 2: Convert to fraction form
   2,091.40/2,886.15 = 1,147.18/x
3. Step 3: Cross multiply
   2,091.40x = 2,886.15 × 1,147.18
4. Step 4: Simplify right side
   2,091.40x = 3,310,933.56
5. Step 5: Solve for x
   x = 3,310,933.56/2,091.40
6. Step 6: Final answer
   x = 1,583.12