Finding the Fourth Proportional to 2,654.13, 3,978.36 and 1,266.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,654.13 : 3,978.36 = 1,266.60 : x
2. Step 2: Convert to fraction form
   2,654.13/3,978.36 = 1,266.60/x
3. Step 3: Cross multiply
   2,654.13x = 3,978.36 × 1,266.60
4. Step 4: Simplify right side
   2,654.13x = 5,038,990.78
5. Step 5: Solve for x
   x = 5,038,990.78/2,654.13
6. Step 6: Final answer
   x = 1,898.55