Finding the Fourth Proportional to 12,830.21, 19,229.59 and 7,288.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,830.21 : 19,229.59 = 7,288.22 : x
2. Step 2: Convert to fraction form
   12,830.21/19,229.59 = 7,288.22/x
3. Step 3: Cross multiply
   12,830.21x = 19,229.59 × 7,288.22
4. Step 4: Simplify right side
   12,830.21x = 140,149,482.43
5. Step 5: Solve for x
   x = 140,149,482.43/12,830.21
6. Step 6: Final answer
   x = 10,923.40