Finding the Fourth Proportional to 31,017.86, 42,804.50 and 16,870.70

Step by Step Solution

1. Step 1: Write the proportion equation
   31,017.86 : 42,804.50 = 16,870.70 : x
2. Step 2: Convert to fraction form
   31,017.86/42,804.50 = 16,870.70/x
3. Step 3: Cross multiply
   31,017.86x = 42,804.50 × 16,870.70
4. Step 4: Simplify right side
   31,017.86x = 722,141,579.77
5. Step 5: Solve for x
   x = 722,141,579.77/31,017.86
6. Step 6: Final answer
   x = 23,281.48