Finding the Fourth Proportional to 1,661.11, 2,291.86 and 1,071.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.11 : 2,291.86 = 1,071.98 : x
2. Step 2: Convert to fraction form
   1,661.11/2,291.86 = 1,071.98/x
3. Step 3: Cross multiply
   1,661.11x = 2,291.86 × 1,071.98
4. Step 4: Simplify right side
   1,661.11x = 2,456,822.72
5. Step 5: Solve for x
   x = 2,456,822.72/1,661.11
6. Step 6: Final answer
   x = 1,479.03