Finding the Fourth Proportional to 13,099.77, 18,077.75 and 7,131.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,099.77 : 18,077.75 = 7,131.42 : x
2. Step 2: Convert to fraction form
   13,099.77/18,077.75 = 7,131.42/x
3. Step 3: Cross multiply
   13,099.77x = 18,077.75 × 7,131.42
4. Step 4: Simplify right side
   13,099.77x = 128,919,992.25
5. Step 5: Solve for x
   x = 128,919,992.25/13,099.77
6. Step 6: Final answer
   x = 9,841.39