Finding the Fourth Proportional to 13,123.42, 18,110.25 and 7,155.07

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.42 : 18,110.25 = 7,155.07 : x
2. Step 2: Convert to fraction form
   13,123.42/18,110.25 = 7,155.07/x
3. Step 3: Cross multiply
   13,123.42x = 18,110.25 × 7,155.07
4. Step 4: Simplify right side
   13,123.42x = 129,580,061.19
5. Step 5: Solve for x
   x = 129,580,061.19/13,123.42
6. Step 6: Final answer
   x = 9,873.96