Finding the Fourth Proportional to 12,100.80, 18,124.56 and 7,707.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,100.80 : 18,124.56 = 7,707.36 : x
2. Step 2: Convert to fraction form
   12,100.80/18,124.56 = 7,707.36/x
3. Step 3: Cross multiply
   12,100.80x = 18,124.56 × 7,707.36
4. Step 4: Simplify right side
   12,100.80x = 139,692,508.76
5. Step 5: Solve for x
   x = 139,692,508.76/12,100.80
6. Step 6: Final answer
   x = 11,544.07