Finding the Fourth Proportional to 9,145.10, 12,620.16 and 5,166.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,145.10 : 12,620.16 = 5,166.98 : x
2. Step 2: Convert to fraction form
   9,145.10/12,620.16 = 5,166.98/x
3. Step 3: Cross multiply
   9,145.10x = 12,620.16 × 5,166.98
4. Step 4: Simplify right side
   9,145.10x = 65,208,114.32
5. Step 5: Solve for x
   x = 65,208,114.32/9,145.10
6. Step 6: Final answer
   x = 7,130.39