Finding the Fourth Proportional to 9,145.67, 12,621.28 and 5,166.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.67 : 12,621.28 = 5,166.71 : x
2. Step 2: Convert to fraction form
   9,145.67/12,621.28 = 5,166.71/x
3. Step 3: Cross multiply
   9,145.67x = 12,621.28 × 5,166.71
4. Step 4: Simplify right side
   9,145.67x = 65,210,417.57
5. Step 5: Solve for x
   x = 65,210,417.57/9,145.67
6. Step 6: Final answer
   x = 7,130.19