Finding the Fourth Proportional to 1,378.22, 1,901.72 and 881.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.22 : 1,901.72 = 881.28 : x
2. Step 2: Convert to fraction form
   1,378.22/1,901.72 = 881.28/x
3. Step 3: Cross multiply
   1,378.22x = 1,901.72 × 881.28
4. Step 4: Simplify right side
   1,378.22x = 1,675,947.80
5. Step 5: Solve for x
   x = 1,675,947.80/1,378.22
6. Step 6: Final answer
   x = 1,216.02