Finding the Fourth Proportional to 1,815.18, 2,503.96 and 1,224.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.18 : 2,503.96 = 1,224.69 : x
2. Step 2: Convert to fraction form
   1,815.18/2,503.96 = 1,224.69/x
3. Step 3: Cross multiply
   1,815.18x = 2,503.96 × 1,224.69
4. Step 4: Simplify right side
   1,815.18x = 3,066,574.77
5. Step 5: Solve for x
   x = 3,066,574.77/1,815.18
6. Step 6: Final answer
   x = 1,689.41