Finding the Fourth Proportional to 28,071.12, 42,084.48 and 10,539

Step by Step Solution

1. Step 1: Write the proportion equation
   28,071.12 : 42,084.48 = 10,539 : x
2. Step 2: Convert to fraction form
   28,071.12/42,084.48 = 10,539/x
3. Step 3: Cross multiply
   28,071.12x = 42,084.48 × 10,539
4. Step 4: Simplify right side
   28,071.12x = 443,528,334.72
5. Step 5: Solve for x
   x = 443,528,334.72/28,071.12
6. Step 6: Final answer
   x = 15,800.17