Finding the Fourth Proportional to 1,859.72, 2,788.92 and 1,338.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,859.72 : 2,788.92 = 1,338.15 : x
2. Step 2: Convert to fraction form
   1,859.72/2,788.92 = 1,338.15/x
3. Step 3: Cross multiply
   1,859.72x = 2,788.92 × 1,338.15
4. Step 4: Simplify right side
   1,859.72x = 3,731,993.30
5. Step 5: Solve for x
   x = 3,731,993.30/1,859.72
6. Step 6: Final answer
   x = 2,006.75