Finding the Fourth Proportional to 72,855.36, 109,218.20 and 28,472.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72,855.36 : 109,218.20 = 28,472.02 : x
2. Step 2: Convert to fraction form
   72,855.36/109,218.20 = 28,472.02/x
3. Step 3: Cross multiply
   72,855.36x = 109,218.20 × 28,472.02
4. Step 4: Simplify right side
   72,855.36x = 3,109,662,572.90
5. Step 5: Solve for x
   x = 3,109,662,572.90/72,855.36
6. Step 6: Final answer
   x = 42,682.69