Finding the Fourth Proportional to 1,488.25, 2,231.55 and 611.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.25 : 2,231.55 = 611.37 : x
2. Step 2: Convert to fraction form
   1,488.25/2,231.55 = 611.37/x
3. Step 3: Cross multiply
   1,488.25x = 2,231.55 × 611.37
4. Step 4: Simplify right side
   1,488.25x = 1,364,302.72
5. Step 5: Solve for x
   x = 1,364,302.72/1,488.25
6. Step 6: Final answer
   x = 916.72