Finding the Fourth Proportional to 1,290.33, 1,935.54 and 1,224.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.33 : 1,935.54 = 1,224.72 : x
2. Step 2: Convert to fraction form
   1,290.33/1,935.54 = 1,224.72/x
3. Step 3: Cross multiply
   1,290.33x = 1,935.54 × 1,224.72
4. Step 4: Simplify right side
   1,290.33x = 2,370,494.55
5. Step 5: Solve for x
   x = 2,370,494.55/1,290.33
6. Step 6: Final answer
   x = 1,837.12