Finding the Fourth Proportional to 21,077.72, 31,605.96 and 7,032.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,077.72 : 31,605.96 = 7,032.88 : x
2. Step 2: Convert to fraction form
   21,077.72/31,605.96 = 7,032.88/x
3. Step 3: Cross multiply
   21,077.72x = 31,605.96 × 7,032.88
4. Step 4: Simplify right side
   21,077.72x = 222,280,923.96
5. Step 5: Solve for x
   x = 222,280,923.96/21,077.72
6. Step 6: Final answer
   x = 10,545.78