Finding the Fourth Proportional to 13,091.45, 18,066.24 and 7,123.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.45 : 18,066.24 = 7,123.12 : x
2. Step 2: Convert to fraction form
   13,091.45/18,066.24 = 7,123.12/x
3. Step 3: Cross multiply
   13,091.45x = 18,066.24 × 7,123.12
4. Step 4: Simplify right side
   13,091.45x = 128,687,995.47
5. Step 5: Solve for x
   x = 128,687,995.47/13,091.45
6. Step 6: Final answer
   x = 9,829.93