Finding the Fourth Proportional to 12,438.05, 17,169.78 and 7,402.73

Step by Step Solution

1. Step 1: Write the proportion equation
   12,438.05 : 17,169.78 = 7,402.73 : x
2. Step 2: Convert to fraction form
   12,438.05/17,169.78 = 7,402.73/x
3. Step 3: Cross multiply
   12,438.05x = 17,169.78 × 7,402.73
4. Step 4: Simplify right side
   12,438.05x = 127,103,159.65
5. Step 5: Solve for x
   x = 127,103,159.65/12,438.05
6. Step 6: Final answer
   x = 10,218.90