Finding the Fourth Proportional to 1,111.78, 1,668.08 and 591.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.78 : 1,668.08 = 591.83 : x
2. Step 2: Convert to fraction form
   1,111.78/1,668.08 = 591.83/x
3. Step 3: Cross multiply
   1,111.78x = 1,668.08 × 591.83
4. Step 4: Simplify right side
   1,111.78x = 987,219.79
5. Step 5: Solve for x
   x = 987,219.79/1,111.78
6. Step 6: Final answer
   x = 887.96