Finding the Fourth Proportional to 31,013.08, 42,813.94 and 20,994.52

Step by Step Solution

1. Step 1: Write the proportion equation
   31,013.08 : 42,813.94 = 20,994.52 : x
2. Step 2: Convert to fraction form
   31,013.08/42,813.94 = 20,994.52/x
3. Step 3: Cross multiply
   31,013.08x = 42,813.94 × 20,994.52
4. Step 4: Simplify right side
   31,013.08x = 898,858,119.61
5. Step 5: Solve for x
   x = 898,858,119.61/31,013.08
6. Step 6: Final answer
   x = 28,983.19