Finding the Fourth Proportional to 31,017.68, 42,800.52 and 20,967.98

Step by Step Solution

1. Step 1: Write the proportion equation
   31,017.68 : 42,800.52 = 20,967.98 : x
2. Step 2: Convert to fraction form
   31,017.68/42,800.52 = 20,967.98/x
3. Step 3: Cross multiply
   31,017.68x = 42,800.52 × 20,967.98
4. Step 4: Simplify right side
   31,017.68x = 897,440,447.35
5. Step 5: Solve for x
   x = 897,440,447.35/31,017.68
6. Step 6: Final answer
   x = 28,933.19