Finding the Fourth Proportional to 28,109.57, 42,143.49 and 17,013.61

Step by Step Solution

1. Step 1: Write the proportion equation
   28,109.57 : 42,143.49 = 17,013.61 : x
2. Step 2: Convert to fraction form
   28,109.57/42,143.49 = 17,013.61/x
3. Step 3: Cross multiply
   28,109.57x = 42,143.49 × 17,013.61
4. Step 4: Simplify right side
   28,109.57x = 717,012,955.58
5. Step 5: Solve for x
   x = 717,012,955.58/28,109.57
6. Step 6: Final answer
   x = 25,507.79