Finding the Fourth Proportional to 28,594.47, 42,920.76 and 13,815.83

Step by Step Solution

1. Step 1: Write the proportion equation
   28,594.47 : 42,920.76 = 13,815.83 : x
2. Step 2: Convert to fraction form
   28,594.47/42,920.76 = 13,815.83/x
3. Step 3: Cross multiply
   28,594.47x = 42,920.76 × 13,815.83
4. Step 4: Simplify right side
   28,594.47x = 592,985,709.03
5. Step 5: Solve for x
   x = 592,985,709.03/28,594.47
6. Step 6: Final answer
   x = 20,737.78