Finding the Fourth Proportional to 91,028.72, 136,523.64 and 28,684.64

Step by Step Solution

1. Step 1: Write the proportion equation
   91,028.72 : 136,523.64 = 28,684.64 : x
2. Step 2: Convert to fraction form
   91,028.72/136,523.64 = 28,684.64/x
3. Step 3: Cross multiply
   91,028.72x = 136,523.64 × 28,684.64
4. Step 4: Simplify right side
   91,028.72x = 3,916,131,464.89
5. Step 5: Solve for x
   x = 3,916,131,464.89/91,028.72
6. Step 6: Final answer
   x = 43,020.83