Finding the Fourth Proportional to 12,145.85, 16,765.47 and 7,111.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,145.85 : 16,765.47 = 7,111.69 : x
2. Step 2: Convert to fraction form
   12,145.85/16,765.47 = 7,111.69/x
3. Step 3: Cross multiply
   12,145.85x = 16,765.47 × 7,111.69
4. Step 4: Simplify right side
   12,145.85x = 119,230,830.58
5. Step 5: Solve for x
   x = 119,230,830.58/12,145.85
6. Step 6: Final answer
   x = 9,816.59