Finding the Fourth Proportional to 30,915, 42,662.71 and 17,485.97

Step by Step Solution

1. Step 1: Write the proportion equation
   30,915 : 42,662.71 = 17,485.97 : x
2. Step 2: Convert to fraction form
   30,915/42,662.71 = 17,485.97/x
3. Step 3: Cross multiply
   30,915x = 42,662.71 × 17,485.97
4. Step 4: Simplify right side
   30,915x = 745,998,577.36
5. Step 5: Solve for x
   x = 745,998,577.36/30,915
6. Step 6: Final answer
   x = 24,130.63