Finding the Fourth Proportional to 28,107.60, 42,136.92 and 10,572.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,107.60 : 42,136.92 = 10,572.72 : x
2. Step 2: Convert to fraction form
   28,107.60/42,136.92 = 10,572.72/x
3. Step 3: Cross multiply
   28,107.60x = 42,136.92 × 10,572.72
4. Step 4: Simplify right side
   28,107.60x = 445,501,856.82
5. Step 5: Solve for x
   x = 445,501,856.82/28,107.60
6. Step 6: Final answer
   x = 15,849.87