Finding the Fourth Proportional to 31,017.20, 42,803.71 and 16,870.01

Step by Step Solution

1. Step 1: Write the proportion equation
   31,017.20 : 42,803.71 = 16,870.01 : x
2. Step 2: Convert to fraction form
   31,017.20/42,803.71 = 16,870.01/x
3. Step 3: Cross multiply
   31,017.20x = 42,803.71 × 16,870.01
4. Step 4: Simplify right side
   31,017.20x = 722,098,759.54
5. Step 5: Solve for x
   x = 722,098,759.54/31,017.20
6. Step 6: Final answer
   x = 23,280.60