Finding the Fourth Proportional to 30,915.10, 42,663.61 and 17,485.71

Step by Step Solution

1. Step 1: Write the proportion equation
   30,915.10 : 42,663.61 = 17,485.71 : x
2. Step 2: Convert to fraction form
   30,915.10/42,663.61 = 17,485.71/x
3. Step 3: Cross multiply
   30,915.10x = 42,663.61 × 17,485.71
4. Step 4: Simplify right side
   30,915.10x = 746,003,512.01
5. Step 5: Solve for x
   x = 746,003,512.01/30,915.10
6. Step 6: Final answer
   x = 24,130.72