Finding the Fourth Proportional to 2,151.55, 2,969.78 and 1,267.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.55 : 2,969.78 = 1,267.64 : x
2. Step 2: Convert to fraction form
   2,151.55/2,969.78 = 1,267.64/x
3. Step 3: Cross multiply
   2,151.55x = 2,969.78 × 1,267.64
4. Step 4: Simplify right side
   2,151.55x = 3,764,598.16
5. Step 5: Solve for x
   x = 3,764,598.16/2,151.55
6. Step 6: Final answer
   x = 1,749.71