Finding the Fourth Proportional to 1,288.08, 1,789.74 and 1,274.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.08 : 1,789.74 = 1,274.52 : x
2. Step 2: Convert to fraction form
   1,288.08/1,789.74 = 1,274.52/x
3. Step 3: Cross multiply
   1,288.08x = 1,789.74 × 1,274.52
4. Step 4: Simplify right side
   1,288.08x = 2,281,059.42
5. Step 5: Solve for x
   x = 2,281,059.42/1,288.08
6. Step 6: Final answer
   x = 1,770.90