Finding the Fourth Proportional to 1,053.55, 1,578.34 and 881.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.55 : 1,578.34 = 881.32 : x
2. Step 2: Convert to fraction form
   1,053.55/1,578.34 = 881.32/x
3. Step 3: Cross multiply
   1,053.55x = 1,578.34 × 881.32
4. Step 4: Simplify right side
   1,053.55x = 1,391,022.61
5. Step 5: Solve for x
   x = 1,391,022.61/1,053.55
6. Step 6: Final answer
   x = 1,320.33