Finding the Fourth Proportional to 28,308.57, 42,448.27 and 10,531.91

Step by Step Solution

1. Step 1: Write the proportion equation
   28,308.57 : 42,448.27 = 10,531.91 : x
2. Step 2: Convert to fraction form
   28,308.57/42,448.27 = 10,531.91/x
3. Step 3: Cross multiply
   28,308.57x = 42,448.27 × 10,531.91
4. Step 4: Simplify right side
   28,308.57x = 447,061,359.30
5. Step 5: Solve for x
   x = 447,061,359.30/28,308.57
6. Step 6: Final answer
   x = 15,792.44