Finding the Fourth Proportional to 1,111.80, 1,665.46 and 881.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.80 : 1,665.46 = 881.08 : x
2. Step 2: Convert to fraction form
   1,111.80/1,665.46 = 881.08/x
3. Step 3: Cross multiply
   1,111.80x = 1,665.46 × 881.08
4. Step 4: Simplify right side
   1,111.80x = 1,467,403.50
5. Step 5: Solve for x
   x = 1,467,403.50/1,111.80
6. Step 6: Final answer
   x = 1,319.84