Finding the Fourth Proportional to 13,123.34, 18,109.84 and 7,155.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.34 : 18,109.84 = 7,155.12 : x
2. Step 2: Convert to fraction form
   13,123.34/18,109.84 = 7,155.12/x
3. Step 3: Cross multiply
   13,123.34x = 18,109.84 × 7,155.12
4. Step 4: Simplify right side
   13,123.34x = 129,578,078.38
5. Step 5: Solve for x
   x = 129,578,078.38/13,123.34
6. Step 6: Final answer
   x = 9,873.86