Finding the Fourth Proportional to 9,145.86, 12,621.78 and 5,167.14

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.86 : 12,621.78 = 5,167.14 : x
2. Step 2: Convert to fraction form
   9,145.86/12,621.78 = 5,167.14/x
3. Step 3: Cross multiply
   9,145.86x = 12,621.78 × 5,167.14
4. Step 4: Simplify right side
   9,145.86x = 65,218,504.31
5. Step 5: Solve for x
   x = 65,218,504.31/9,145.86
6. Step 6: Final answer
   x = 7,130.93