Finding the Fourth Proportional to 1,111.42, 1,668.14 and 591.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.42 : 1,668.14 = 591.86 : x
2. Step 2: Convert to fraction form
   1,111.42/1,668.14 = 591.86/x
3. Step 3: Cross multiply
   1,111.42x = 1,668.14 × 591.86
4. Step 4: Simplify right side
   1,111.42x = 987,294.04
5. Step 5: Solve for x
   x = 987,294.04/1,111.42
6. Step 6: Final answer
   x = 888.32