Finding the Fourth Proportional to 31,069.85, 42,862.74 and 20,994.61

Step by Step Solution

1. Step 1: Write the proportion equation
   31,069.85 : 42,862.74 = 20,994.61 : x
2. Step 2: Convert to fraction form
   31,069.85/42,862.74 = 20,994.61/x
3. Step 3: Cross multiply
   31,069.85x = 42,862.74 × 20,994.61
4. Step 4: Simplify right side
   31,069.85x = 899,886,404.31
5. Step 5: Solve for x
   x = 899,886,404.31/31,069.85
6. Step 6: Final answer
   x = 28,963.34