Finding the Fourth Proportional to 1,111.96, 1,668.30 and 381.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.96 : 1,668.30 = 381.52 : x
2. Step 2: Convert to fraction form
   1,111.96/1,668.30 = 381.52/x
3. Step 3: Cross multiply
   1,111.96x = 1,668.30 × 381.52
4. Step 4: Simplify right side
   1,111.96x = 636,489.82
5. Step 5: Solve for x
   x = 636,489.82/1,111.96
6. Step 6: Final answer
   x = 572.40