Finding the Fourth Proportional to 28,082.85, 42,111.77 and 10,540.28

Step by Step Solution

1. Step 1: Write the proportion equation
   28,082.85 : 42,111.77 = 10,540.28 : x
2. Step 2: Convert to fraction form
   28,082.85/42,111.77 = 10,540.28/x
3. Step 3: Cross multiply
   28,082.85x = 42,111.77 × 10,540.28
4. Step 4: Simplify right side
   28,082.85x = 443,869,583.84
5. Step 5: Solve for x
   x = 443,869,583.84/28,082.85
6. Step 6: Final answer
   x = 15,805.72