Finding the Fourth Proportional to 12,145.76, 16,765.34 and 7,111.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,145.76 : 16,765.34 = 7,111.60 : x
2. Step 2: Convert to fraction form
   12,145.76/16,765.34 = 7,111.60/x
3. Step 3: Cross multiply
   12,145.76x = 16,765.34 × 7,111.60
4. Step 4: Simplify right side
   12,145.76x = 119,228,308.12
5. Step 5: Solve for x
   x = 119,228,308.12/12,145.76
6. Step 6: Final answer
   x = 9,816.46