Finding the Fourth Proportional to 2,091.81, 2,886.70 and 1,160.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.81 : 2,886.70 = 1,160.31 : x
2. Step 2: Convert to fraction form
   2,091.81/2,886.70 = 1,160.31/x
3. Step 3: Cross multiply
   2,091.81x = 2,886.70 × 1,160.31
4. Step 4: Simplify right side
   2,091.81x = 3,349,466.88
5. Step 5: Solve for x
   x = 3,349,466.88/2,091.81
6. Step 6: Final answer
   x = 1,601.23