Finding the Fourth Proportional to 13,116.67, 18,105.71 and 7,811.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,116.67 : 18,105.71 = 7,811.37 : x
2. Step 2: Convert to fraction form
   13,116.67/18,105.71 = 7,811.37/x
3. Step 3: Cross multiply
   13,116.67x = 18,105.71 × 7,811.37
4. Step 4: Simplify right side
   13,116.67x = 141,430,360.87
5. Step 5: Solve for x
   x = 141,430,360.87/13,116.67
6. Step 6: Final answer
   x = 10,782.49