Finding the Fourth Proportional to 28,569.50, 42,881.90 and 13,788.83

Step by Step Solution

1. Step 1: Write the proportion equation
   28,569.50 : 42,881.90 = 13,788.83 : x
2. Step 2: Convert to fraction form
   28,569.50/42,881.90 = 13,788.83/x
3. Step 3: Cross multiply
   28,569.50x = 42,881.90 × 13,788.83
4. Step 4: Simplify right side
   28,569.50x = 591,290,945.82
5. Step 5: Solve for x
   x = 591,290,945.82/28,569.50
6. Step 6: Final answer
   x = 20,696.58