Finding the Fourth Proportional to 10,820.79, 16,221.47 and 5,610.87

Step by Step Solution

1. Step 1: Write the proportion equation
   10,820.79 : 16,221.47 = 5,610.87 : x
2. Step 2: Convert to fraction form
   10,820.79/16,221.47 = 5,610.87/x
3. Step 3: Cross multiply
   10,820.79x = 16,221.47 × 5,610.87
4. Step 4: Simplify right side
   10,820.79x = 91,016,531.32
5. Step 5: Solve for x
   x = 91,016,531.32/10,820.79
6. Step 6: Final answer
   x = 8,411.26