Finding the Fourth Proportional to 8,834.17, 12,190.89 and 5,057.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,834.17 : 12,190.89 = 5,057.21 : x
2. Step 2: Convert to fraction form
   8,834.17/12,190.89 = 5,057.21/x
3. Step 3: Cross multiply
   8,834.17x = 12,190.89 × 5,057.21
4. Step 4: Simplify right side
   8,834.17x = 61,651,890.82
5. Step 5: Solve for x
   x = 61,651,890.82/8,834.17
6. Step 6: Final answer
   x = 6,978.80