Finding the Fourth Proportional to 21,870.96, 32,808.24 and 6,288.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,870.96 : 32,808.24 = 6,288.72 : x
2. Step 2: Convert to fraction form
   21,870.96/32,808.24 = 6,288.72/x
3. Step 3: Cross multiply
   21,870.96x = 32,808.24 × 6,288.72
4. Step 4: Simplify right side
   21,870.96x = 206,321,835.05
5. Step 5: Solve for x
   x = 206,321,835.05/21,870.96
6. Step 6: Final answer
   x = 9,433.60