Finding the Fourth Proportional to 10,810.83, 16,211.21 and 5,615.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,810.83 : 16,211.21 = 5,615.31 : x
2. Step 2: Convert to fraction form
   10,810.83/16,211.21 = 5,615.31/x
3. Step 3: Cross multiply
   10,810.83x = 16,211.21 × 5,615.31
4. Step 4: Simplify right side
   10,810.83x = 91,030,941.55
5. Step 5: Solve for x
   x = 91,030,941.55/10,810.83
6. Step 6: Final answer
   x = 8,420.35