Finding the Fourth Proportional to 28,168.84, 42,258.91 and 10,399.61

Step by Step Solution

1. Step 1: Write the proportion equation
   28,168.84 : 42,258.91 = 10,399.61 : x
2. Step 2: Convert to fraction form
   28,168.84/42,258.91 = 10,399.61/x
3. Step 3: Cross multiply
   28,168.84x = 42,258.91 × 10,399.61
4. Step 4: Simplify right side
   28,168.84x = 439,476,227.10
5. Step 5: Solve for x
   x = 439,476,227.10/28,168.84
6. Step 6: Final answer
   x = 15,601.50