Finding the Fourth Proportional to 1,815.12, 2,501.46 and 1,290.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.12 : 2,501.46 = 1,290.24 : x
2. Step 2: Convert to fraction form
   1,815.12/2,501.46 = 1,290.24/x
3. Step 3: Cross multiply
   1,815.12x = 2,501.46 × 1,290.24
4. Step 4: Simplify right side
   1,815.12x = 3,227,483.75
5. Step 5: Solve for x
   x = 3,227,483.75/1,815.12
6. Step 6: Final answer
   x = 1,778.11