Finding the Fourth Proportional to 72,783.24, 109,151.64 and 28,399.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,783.24 : 109,151.64 = 28,399.20 : x
2. Step 2: Convert to fraction form
   72,783.24/109,151.64 = 28,399.20/x
3. Step 3: Cross multiply
   72,783.24x = 109,151.64 × 28,399.20
4. Step 4: Simplify right side
   72,783.24x = 3,099,819,254.69
5. Step 5: Solve for x
   x = 3,099,819,254.69/72,783.24
6. Step 6: Final answer
   x = 42,589.74