Finding the Fourth Proportional to 9,145.76, 12,621.49 and 5,167.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.76 : 12,621.49 = 5,167.31 : x
2. Step 2: Convert to fraction form
   9,145.76/12,621.49 = 5,167.31/x
3. Step 3: Cross multiply
   9,145.76x = 12,621.49 × 5,167.31
4. Step 4: Simplify right side
   9,145.76x = 65,219,075.47
5. Step 5: Solve for x
   x = 65,219,075.47/9,145.76
6. Step 6: Final answer
   x = 7,131.08