Finding the Fourth Proportional to 1,378.67, 1,902.01 and 881.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.67 : 1,902.01 = 881.18 : x
2. Step 2: Convert to fraction form
   1,378.67/1,902.01 = 881.18/x
3. Step 3: Cross multiply
   1,378.67x = 1,902.01 × 881.18
4. Step 4: Simplify right side
   1,378.67x = 1,676,013.17
5. Step 5: Solve for x
   x = 1,676,013.17/1,378.67
6. Step 6: Final answer
   x = 1,215.67