Finding the Fourth Proportional to 31,018.68, 42,801.90 and 20,968.98

Step by Step Solution

1. Step 1: Write the proportion equation
   31,018.68 : 42,801.90 = 20,968.98 : x
2. Step 2: Convert to fraction form
   31,018.68/42,801.90 = 20,968.98/x
3. Step 3: Cross multiply
   31,018.68x = 42,801.90 × 20,968.98
4. Step 4: Simplify right side
   31,018.68x = 897,512,185.06
5. Step 5: Solve for x
   x = 897,512,185.06/31,018.68
6. Step 6: Final answer
   x = 28,934.57