Finding the Fourth Proportional to 8,610.91, 11,887.83 and 5,428.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,610.91 : 11,887.83 = 5,428.28 : x
2. Step 2: Convert to fraction form
   8,610.91/11,887.83 = 5,428.28/x
3. Step 3: Cross multiply
   8,610.91x = 11,887.83 × 5,428.28
4. Step 4: Simplify right side
   8,610.91x = 64,530,499.55
5. Step 5: Solve for x
   x = 64,530,499.55/8,610.91
6. Step 6: Final answer
   x = 7,494.04