Finding the Fourth Proportional to 20,991.22, 31,485.78 and 5,196.16

Step by Step Solution

1. Step 1: Write the proportion equation
   20,991.22 : 31,485.78 = 5,196.16 : x
2. Step 2: Convert to fraction form
   20,991.22/31,485.78 = 5,196.16/x
3. Step 3: Cross multiply
   20,991.22x = 31,485.78 × 5,196.16
4. Step 4: Simplify right side
   20,991.22x = 163,605,150.60
5. Step 5: Solve for x
   x = 163,605,150.60/20,991.22
6. Step 6: Final answer
   x = 7,793.98