Finding the Fourth Proportional to 2,310.72, 3,460.96 and 1,321.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,310.72 : 3,460.96 = 1,321.28 : x
2. Step 2: Convert to fraction form
   2,310.72/3,460.96 = 1,321.28/x
3. Step 3: Cross multiply
   2,310.72x = 3,460.96 × 1,321.28
4. Step 4: Simplify right side
   2,310.72x = 4,572,897.23
5. Step 5: Solve for x
   x = 4,572,897.23/2,310.72
6. Step 6: Final answer
   x = 1,978.99