Finding the Fourth Proportional to 2,223.93, 3,336.69 and 991.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,223.93 : 3,336.69 = 991.23 : x
2. Step 2: Convert to fraction form
   2,223.93/3,336.69 = 991.23/x
3. Step 3: Cross multiply
   2,223.93x = 3,336.69 × 991.23
4. Step 4: Simplify right side
   2,223.93x = 3,307,427.23
5. Step 5: Solve for x
   x = 3,307,427.23/2,223.93
6. Step 6: Final answer
   x = 1,487.20