Finding the Fourth Proportional to 13,123.76, 18,110.47 and 7,155.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.76 : 18,110.47 = 7,155.55 : x
2. Step 2: Convert to fraction form
   13,123.76/18,110.47 = 7,155.55/x
3. Step 3: Cross multiply
   13,123.76x = 18,110.47 × 7,155.55
4. Step 4: Simplify right side
   13,123.76x = 129,590,292.55
5. Step 5: Solve for x
   x = 129,590,292.55/13,123.76
6. Step 6: Final answer
   x = 9,874.48