Finding the Fourth Proportional to 13,099.85, 18,077.76 and 7,131.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,099.85 : 18,077.76 = 7,131.56 : x
2. Step 2: Convert to fraction form
   13,099.85/18,077.76 = 7,131.56/x
3. Step 3: Cross multiply
   13,099.85x = 18,077.76 × 7,131.56
4. Step 4: Simplify right side
   13,099.85x = 128,922,504.06
5. Step 5: Solve for x
   x = 128,922,504.06/13,099.85
6. Step 6: Final answer
   x = 9,841.53