Finding the Fourth Proportional to 28,317.94, 42,436.62 and 20,863.78

Step by Step Solution

1. Step 1: Write the proportion equation
   28,317.94 : 42,436.62 = 20,863.78 : x
2. Step 2: Convert to fraction form
   28,317.94/42,436.62 = 20,863.78/x
3. Step 3: Cross multiply
   28,317.94x = 42,436.62 × 20,863.78
4. Step 4: Simplify right side
   28,317.94x = 885,388,303.62
5. Step 5: Solve for x
   x = 885,388,303.62/28,317.94
6. Step 6: Final answer
   x = 31,265.99