Finding the Fourth Proportional to 1,815.45, 2,718.59 and 1,319.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.45 : 2,718.59 = 1,319.91 : x
2. Step 2: Convert to fraction form
   1,815.45/2,718.59 = 1,319.91/x
3. Step 3: Cross multiply
   1,815.45x = 2,718.59 × 1,319.91
4. Step 4: Simplify right side
   1,815.45x = 3,588,287.53
5. Step 5: Solve for x
   x = 3,588,287.53/1,815.45
6. Step 6: Final answer
   x = 1,976.53