Finding the Fourth Proportional to 13,100.09, 18,077.57 and 7,131.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,100.09 : 18,077.57 = 7,131.79 : x
2. Step 2: Convert to fraction form
   13,100.09/18,077.57 = 7,131.79/x
3. Step 3: Cross multiply
   13,100.09x = 18,077.57 × 7,131.79
4. Step 4: Simplify right side
   13,100.09x = 128,925,352.10
5. Step 5: Solve for x
   x = 128,925,352.10/13,100.09
6. Step 6: Final answer
   x = 9,841.56