Finding the Fourth Proportional to 3,513.31, 5,270.23 and 1,321.99

Step by Step Solution

1. Step 1: Write the proportion equation
   3,513.31 : 5,270.23 = 1,321.99 : x
2. Step 2: Convert to fraction form
   3,513.31/5,270.23 = 1,321.99/x
3. Step 3: Cross multiply
   3,513.31x = 5,270.23 × 1,321.99
4. Step 4: Simplify right side
   3,513.31x = 6,967,165.01
5. Step 5: Solve for x
   x = 6,967,165.01/3,513.31
6. Step 6: Final answer
   x = 1,983.08