Finding the Fourth Proportional to 1,392.24, 2,088.16 and 908.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.24 : 2,088.16 = 908.72 : x
2. Step 2: Convert to fraction form
   1,392.24/2,088.16 = 908.72/x
3. Step 3: Cross multiply
   1,392.24x = 2,088.16 × 908.72
4. Step 4: Simplify right side
   1,392.24x = 1,897,552.76
5. Step 5: Solve for x
   x = 1,897,552.76/1,392.24
6. Step 6: Final answer
   x = 1,362.95