Finding the Fourth Proportional to 99,601.20, 149,420.16 and 28,520.82

Step by Step Solution

1. Step 1: Write the proportion equation
   99,601.20 : 149,420.16 = 28,520.82 : x
2. Step 2: Convert to fraction form
   99,601.20/149,420.16 = 28,520.82/x
3. Step 3: Cross multiply
   99,601.20x = 149,420.16 × 28,520.82
4. Step 4: Simplify right side
   99,601.20x = 4,261,585,487.73
5. Step 5: Solve for x
   x = 4,261,585,487.73/99,601.20
6. Step 6: Final answer
   x = 42,786.49