Finding the Fourth Proportional to 1,654.68, 2,479.72 and 1,287.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,654.68 : 2,479.72 = 1,287.80 : x
2. Step 2: Convert to fraction form
   1,654.68/2,479.72 = 1,287.80/x
3. Step 3: Cross multiply
   1,654.68x = 2,479.72 × 1,287.80
4. Step 4: Simplify right side
   1,654.68x = 3,193,383.42
5. Step 5: Solve for x
   x = 3,193,383.42/1,654.68
6. Step 6: Final answer
   x = 1,929.91