Finding the Fourth Proportional to 3,513.86, 5,269.82 and 1,321.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,513.86 : 5,269.82 = 1,321.38 : x
2. Step 2: Convert to fraction form
   3,513.86/5,269.82 = 1,321.38/x
3. Step 3: Cross multiply
   3,513.86x = 5,269.82 × 1,321.38
4. Step 4: Simplify right side
   3,513.86x = 6,963,434.75
5. Step 5: Solve for x
   x = 6,963,434.75/3,513.86
6. Step 6: Final answer
   x = 1,981.71