Finding the Fourth Proportional to 12,830.06, 19,229.36 and 7,288.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,830.06 : 19,229.36 = 7,288.07 : x
2. Step 2: Convert to fraction form
   12,830.06/19,229.36 = 7,288.07/x
3. Step 3: Cross multiply
   12,830.06x = 19,229.36 × 7,288.07
4. Step 4: Simplify right side
   12,830.06x = 140,144,789.15
5. Step 5: Solve for x
   x = 140,144,789.15/12,830.06
6. Step 6: Final answer
   x = 10,923.16