Finding the Fourth Proportional to 9,146.37, 12,621.06 and 5,166.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,146.37 : 12,621.06 = 5,166.72 : x
2. Step 2: Convert to fraction form
   9,146.37/12,621.06 = 5,166.72/x
3. Step 3: Cross multiply
   9,146.37x = 12,621.06 × 5,166.72
4. Step 4: Simplify right side
   9,146.37x = 65,209,483.12
5. Step 5: Solve for x
   x = 65,209,483.12/9,146.37
6. Step 6: Final answer
   x = 7,129.55