Finding the Fourth Proportional to 28,856.82, 43,288.89 and 9,128.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,856.82 : 43,288.89 = 9,128.25 : x
2. Step 2: Convert to fraction form
   28,856.82/43,288.89 = 9,128.25/x
3. Step 3: Cross multiply
   28,856.82x = 43,288.89 × 9,128.25
4. Step 4: Simplify right side
   28,856.82x = 395,151,810.14
5. Step 5: Solve for x
   x = 395,151,810.14/28,856.82
6. Step 6: Final answer
   x = 13,693.53