Finding the Fourth Proportional to 28,105.71, 42,137.71 and 17,009.76

Step by Step Solution

1. Step 1: Write the proportion equation
   28,105.71 : 42,137.71 = 17,009.76 : x
2. Step 2: Convert to fraction form
   28,105.71/42,137.71 = 17,009.76/x
3. Step 3: Cross multiply
   28,105.71x = 42,137.71 × 17,009.76
4. Step 4: Simplify right side
   28,105.71x = 716,752,334.05
5. Step 5: Solve for x
   x = 716,752,334.05/28,105.71
6. Step 6: Final answer
   x = 25,502.02