Finding the Fourth Proportional to 1,405.36, 1,938.30 and 908.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.36 : 1,938.30 = 908.12 : x
2. Step 2: Convert to fraction form
   1,405.36/1,938.30 = 908.12/x
3. Step 3: Cross multiply
   1,405.36x = 1,938.30 × 908.12
4. Step 4: Simplify right side
   1,405.36x = 1,760,209.00
5. Step 5: Solve for x
   x = 1,760,209.00/1,405.36
6. Step 6: Final answer
   x = 1,252.50