Finding the Fourth Proportional to 10,508.67, 15,761.52 and 3,111.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,508.67 : 15,761.52 = 3,111.21 : x
2. Step 2: Convert to fraction form
   10,508.67/15,761.52 = 3,111.21/x
3. Step 3: Cross multiply
   10,508.67x = 15,761.52 × 3,111.21
4. Step 4: Simplify right side
   10,508.67x = 49,037,398.64
5. Step 5: Solve for x
   x = 49,037,398.64/10,508.67
6. Step 6: Final answer
   x = 4,666.38