Finding the Fourth Proportional to 2,698.90, 4,047.71 and 1,311.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,698.90 : 4,047.71 = 1,311.53 : x
2. Step 2: Convert to fraction form
   2,698.90/4,047.71 = 1,311.53/x
3. Step 3: Cross multiply
   2,698.90x = 4,047.71 × 1,311.53
4. Step 4: Simplify right side
   2,698.90x = 5,308,666.30
5. Step 5: Solve for x
   x = 5,308,666.30/2,698.90
6. Step 6: Final answer
   x = 1,966.98