Finding the Fourth Proportional to 28,115.55, 42,152.49 and 17,019.61

Step by Step Solution

1. Step 1: Write the proportion equation
   28,115.55 : 42,152.49 = 17,019.61 : x
2. Step 2: Convert to fraction form
   28,115.55/42,152.49 = 17,019.61/x
3. Step 3: Cross multiply
   28,115.55x = 42,152.49 × 17,019.61
4. Step 4: Simplify right side
   28,115.55x = 717,418,993.02
5. Step 5: Solve for x
   x = 717,418,993.02/28,115.55
6. Step 6: Final answer
   x = 25,516.81