Finding the Fourth Proportional to 1,802.72, 2,698.56 and 1,315.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,802.72 : 2,698.56 = 1,315.64 : x
2. Step 2: Convert to fraction form
   1,802.72/2,698.56 = 1,315.64/x
3. Step 3: Cross multiply
   1,802.72x = 2,698.56 × 1,315.64
4. Step 4: Simplify right side
   1,802.72x = 3,550,333.48
5. Step 5: Solve for x
   x = 3,550,333.48/1,802.72
6. Step 6: Final answer
   x = 1,969.43