Finding the Fourth Proportional to 13,123.22, 18,109.98 and 7,155

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.22 : 18,109.98 = 7,155 : x
2. Step 2: Convert to fraction form
   13,123.22/18,109.98 = 7,155/x
3. Step 3: Cross multiply
   13,123.22x = 18,109.98 × 7,155
4. Step 4: Simplify right side
   13,123.22x = 129,576,906.90
5. Step 5: Solve for x
   x = 129,576,906.90/13,123.22
6. Step 6: Final answer
   x = 9,873.87