Finding the Fourth Proportional to 1,011.89, 1,509.98 and 908.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.89 : 1,509.98 = 908.48 : x
2. Step 2: Convert to fraction form
   1,011.89/1,509.98 = 908.48/x
3. Step 3: Cross multiply
   1,011.89x = 1,509.98 × 908.48
4. Step 4: Simplify right side
   1,011.89x = 1,371,785.86
5. Step 5: Solve for x
   x = 1,371,785.86/1,011.89
6. Step 6: Final answer
   x = 1,355.66