Finding the Fourth Proportional to 9,122.82, 12,589.37 and 5,145.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,122.82 : 12,589.37 = 5,145.21 : x
2. Step 2: Convert to fraction form
   9,122.82/12,589.37 = 5,145.21/x
3. Step 3: Cross multiply
   9,122.82x = 12,589.37 × 5,145.21
4. Step 4: Simplify right side
   9,122.82x = 64,774,945.99
5. Step 5: Solve for x
   x = 64,774,945.99/9,122.82
6. Step 6: Final answer
   x = 7,100.32