Finding the Fourth Proportional to 1,396.86, 1,925.82 and 1,003.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.86 : 1,925.82 = 1,003.20 : x
2. Step 2: Convert to fraction form
   1,396.86/1,925.82 = 1,003.20/x
3. Step 3: Cross multiply
   1,396.86x = 1,925.82 × 1,003.20
4. Step 4: Simplify right side
   1,396.86x = 1,931,982.62
5. Step 5: Solve for x
   x = 1,931,982.62/1,396.86
6. Step 6: Final answer
   x = 1,383.09