Finding the Fourth Proportional to 31,016.68, 42,799.14 and 20,966.98

Step by Step Solution

1. Step 1: Write the proportion equation
   31,016.68 : 42,799.14 = 20,966.98 : x
2. Step 2: Convert to fraction form
   31,016.68/42,799.14 = 20,966.98/x
3. Step 3: Cross multiply
   31,016.68x = 42,799.14 × 20,966.98
4. Step 4: Simplify right side
   31,016.68x = 897,368,712.40
5. Step 5: Solve for x
   x = 897,368,712.40/31,016.68
6. Step 6: Final answer
   x = 28,931.81