Finding the Fourth Proportional to 1,819.29, 2,510.61 and 991.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,819.29 : 2,510.61 = 991.29 : x
2. Step 2: Convert to fraction form
   1,819.29/2,510.61 = 991.29/x
3. Step 3: Cross multiply
   1,819.29x = 2,510.61 × 991.29
4. Step 4: Simplify right side
   1,819.29x = 2,488,730.03
5. Step 5: Solve for x
   x = 2,488,730.03/1,819.29
6. Step 6: Final answer
   x = 1,367.97