Finding the Fourth Proportional to 2,166.56, 2,990.61 and 1,283.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,166.56 : 2,990.61 = 1,283.12 : x
2. Step 2: Convert to fraction form
   2,166.56/2,990.61 = 1,283.12/x
3. Step 3: Cross multiply
   2,166.56x = 2,990.61 × 1,283.12
4. Step 4: Simplify right side
   2,166.56x = 3,837,296.55
5. Step 5: Solve for x
   x = 3,837,296.55/2,166.56
6. Step 6: Final answer
   x = 1,771.15