Finding the Fourth Proportional to 91,309.92, 136,986.72 and 28,980.48

Step by Step Solution

1. Step 1: Write the proportion equation
   91,309.92 : 136,986.72 = 28,980.48 : x
2. Step 2: Convert to fraction form
   91,309.92/136,986.72 = 28,980.48/x
3. Step 3: Cross multiply
   91,309.92x = 136,986.72 × 28,980.48
4. Step 4: Simplify right side
   91,309.92x = 3,969,940,899.23
5. Step 5: Solve for x
   x = 3,969,940,899.23/91,309.92
6. Step 6: Final answer
   x = 43,477.65