Finding the Fourth Proportional to 2,091.91, 2,886.02 and 1,207.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,091.91 : 2,886.02 = 1,207.55 : x
2. Step 2: Convert to fraction form
   2,091.91/2,886.02 = 1,207.55/x
3. Step 3: Cross multiply
   2,091.91x = 2,886.02 × 1,207.55
4. Step 4: Simplify right side
   2,091.91x = 3,485,013.45
5. Step 5: Solve for x
   x = 3,485,013.45/2,091.91
6. Step 6: Final answer
   x = 1,665.95