Finding the Fourth Proportional to 72,601.20, 108,906.12 and 28,213.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,601.20 : 108,906.12 = 28,213.20 : x
2. Step 2: Convert to fraction form
   72,601.20/108,906.12 = 28,213.20/x
3. Step 3: Cross multiply
   72,601.20x = 108,906.12 × 28,213.20
4. Step 4: Simplify right side
   72,601.20x = 3,072,590,144.78
5. Step 5: Solve for x
   x = 3,072,590,144.78/72,601.20
6. Step 6: Final answer
   x = 42,321.48