Finding the Fourth Proportional to 21,150.60, 31,719.72 and 7,109.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,150.60 : 31,719.72 = 7,109.04 : x
2. Step 2: Convert to fraction form
   21,150.60/31,719.72 = 7,109.04/x
3. Step 3: Cross multiply
   21,150.60x = 31,719.72 × 7,109.04
4. Step 4: Simplify right side
   21,150.60x = 225,496,758.27
5. Step 5: Solve for x
   x = 225,496,758.27/21,150.60
6. Step 6: Final answer
   x = 10,661.48