Finding the Fourth Proportional to 1,403.42, 1,935.86 and 905.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.42 : 1,935.86 = 905.28 : x
2. Step 2: Convert to fraction form
   1,403.42/1,935.86 = 905.28/x
3. Step 3: Cross multiply
   1,403.42x = 1,935.86 × 905.28
4. Step 4: Simplify right side
   1,403.42x = 1,752,495.34
5. Step 5: Solve for x
   x = 1,752,495.34/1,403.42
6. Step 6: Final answer
   x = 1,248.73