Finding the Fourth Proportional to 31,020, 42,806.52 and 16,872.60

Step by Step Solution

1. Step 1: Write the proportion equation
   31,020 : 42,806.52 = 16,872.60 : x
2. Step 2: Convert to fraction form
   31,020/42,806.52 = 16,872.60/x
3. Step 3: Cross multiply
   31,020x = 42,806.52 × 16,872.60
4. Step 4: Simplify right side
   31,020x = 722,257,289.35
5. Step 5: Solve for x
   x = 722,257,289.35/31,020
6. Step 6: Final answer
   x = 23,283.60