Finding the Fourth Proportional to 28,123.09, 42,205.37 and 13,331.95

Step by Step Solution

1. Step 1: Write the proportion equation
   28,123.09 : 42,205.37 = 13,331.95 : x
2. Step 2: Convert to fraction form
   28,123.09/42,205.37 = 13,331.95/x
3. Step 3: Cross multiply
   28,123.09x = 42,205.37 × 13,331.95
4. Step 4: Simplify right side
   28,123.09x = 562,679,815.91
5. Step 5: Solve for x
   x = 562,679,815.91/28,123.09
6. Step 6: Final answer
   x = 20,007.75