Finding the Fourth Proportional to 21,120.48, 31,675.72 and 7,081.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,120.48 : 31,675.72 = 7,081.02 : x
2. Step 2: Convert to fraction form
   21,120.48/31,675.72 = 7,081.02/x
3. Step 3: Cross multiply
   21,120.48x = 31,675.72 × 7,081.02
4. Step 4: Simplify right side
   21,120.48x = 224,296,406.83
5. Step 5: Solve for x
   x = 224,296,406.83/21,120.48
6. Step 6: Final answer
   x = 10,619.85