Finding the Fourth Proportional to 1,355.88, 1,871.72 and 908.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.88 : 1,871.72 = 908.49 : x
2. Step 2: Convert to fraction form
   1,355.88/1,871.72 = 908.49/x
3. Step 3: Cross multiply
   1,355.88x = 1,871.72 × 908.49
4. Step 4: Simplify right side
   1,355.88x = 1,700,438.90
5. Step 5: Solve for x
   x = 1,700,438.90/1,355.88
6. Step 6: Final answer
   x = 1,254.12