Finding the Fourth Proportional to 2,091.90, 2,886.72 and 1,147.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.90 : 2,886.72 = 1,147.68 : x
2. Step 2: Convert to fraction form
   2,091.90/2,886.72 = 1,147.68/x
3. Step 3: Cross multiply
   2,091.90x = 2,886.72 × 1,147.68
4. Step 4: Simplify right side
   2,091.90x = 3,313,030.81
5. Step 5: Solve for x
   x = 3,313,030.81/2,091.90
6. Step 6: Final answer
   x = 1,583.74