Finding the Fourth Proportional to 1,815.32, 2,501.52 and 1,290.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.32 : 2,501.52 = 1,290.44 : x
2. Step 2: Convert to fraction form
   1,815.32/2,501.52 = 1,290.44/x
3. Step 3: Cross multiply
   1,815.32x = 2,501.52 × 1,290.44
4. Step 4: Simplify right side
   1,815.32x = 3,228,061.47
5. Step 5: Solve for x
   x = 3,228,061.47/1,815.32
6. Step 6: Final answer
   x = 1,778.23