Finding the Fourth Proportional to 28,145.99, 42,177.20 and 15,648.82

Step by Step Solution

1. Step 1: Write the proportion equation
   28,145.99 : 42,177.20 = 15,648.82 : x
2. Step 2: Convert to fraction form
   28,145.99/42,177.20 = 15,648.82/x
3. Step 3: Cross multiply
   28,145.99x = 42,177.20 × 15,648.82
4. Step 4: Simplify right side
   28,145.99x = 660,023,410.90
5. Step 5: Solve for x
   x = 660,023,410.90/28,145.99
6. Step 6: Final answer
   x = 23,450.00