Finding the Fourth Proportional to 1,111.41, 1,664.69 and 880.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.41 : 1,664.69 = 880.56 : x
2. Step 2: Convert to fraction form
   1,111.41/1,664.69 = 880.56/x
3. Step 3: Cross multiply
   1,111.41x = 1,664.69 × 880.56
4. Step 4: Simplify right side
   1,111.41x = 1,465,855.02
5. Step 5: Solve for x
   x = 1,465,855.02/1,111.41
6. Step 6: Final answer
   x = 1,318.91