Finding the Fourth Proportional to 1,403.72, 2,101.91 and 909.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.72 : 2,101.91 = 909.37 : x
2. Step 2: Convert to fraction form
   1,403.72/2,101.91 = 909.37/x
3. Step 3: Cross multiply
   1,403.72x = 2,101.91 × 909.37
4. Step 4: Simplify right side
   1,403.72x = 1,911,404.10
5. Step 5: Solve for x
   x = 1,911,404.10/1,403.72
6. Step 6: Final answer
   x = 1,361.67