Finding the Fourth Proportional to 8,402.08, 11,591.76 and 8,389.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,402.08 : 11,591.76 = 8,389.12 : x
2. Step 2: Convert to fraction form
   8,402.08/11,591.76 = 8,389.12/x
3. Step 3: Cross multiply
   8,402.08x = 11,591.76 × 8,389.12
4. Step 4: Simplify right side
   8,402.08x = 97,244,665.65
5. Step 5: Solve for x
   x = 97,244,665.65/8,402.08
6. Step 6: Final answer
   x = 11,573.88