Finding the Fourth Proportional to 1,403.40, 1,934.04 and 1,009.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.40 : 1,934.04 = 1,009.72 : x
2. Step 2: Convert to fraction form
   1,403.40/1,934.04 = 1,009.72/x
3. Step 3: Cross multiply
   1,403.40x = 1,934.04 × 1,009.72
4. Step 4: Simplify right side
   1,403.40x = 1,952,838.87
5. Step 5: Solve for x
   x = 1,952,838.87/1,403.40
6. Step 6: Final answer
   x = 1,391.51