Finding the Fourth Proportional to 28,080.49, 42,107.58 and 10,306.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,080.49 : 42,107.58 = 10,306.72 : x
2. Step 2: Convert to fraction form
   28,080.49/42,107.58 = 10,306.72/x
3. Step 3: Cross multiply
   28,080.49x = 42,107.58 × 10,306.72
4. Step 4: Simplify right side
   28,080.49x = 433,991,036.94
5. Step 5: Solve for x
   x = 433,991,036.94/28,080.49
6. Step 6: Final answer
   x = 15,455.25