Finding the Fourth Proportional to 12,820.07, 19,225.42 and 5,425.11

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.07 : 19,225.42 = 5,425.11 : x
2. Step 2: Convert to fraction form
   12,820.07/19,225.42 = 5,425.11/x
3. Step 3: Cross multiply
   12,820.07x = 19,225.42 × 5,425.11
4. Step 4: Simplify right side
   12,820.07x = 104,300,004.73
5. Step 5: Solve for x
   x = 104,300,004.73/12,820.07
6. Step 6: Final answer
   x = 8,135.68