Finding the Fourth Proportional to 31,018.86, 42,806.48 and 16,871.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,018.86 : 42,806.48 = 16,871.75 : x
2. Step 2: Convert to fraction form
   31,018.86/42,806.48 = 16,871.75/x
3. Step 3: Cross multiply
   31,018.86x = 42,806.48 × 16,871.75
4. Step 4: Simplify right side
   31,018.86x = 722,219,930.55
5. Step 5: Solve for x
   x = 722,219,930.55/31,018.86
6. Step 6: Final answer
   x = 23,283.25