Finding the Fourth Proportional to 13,079.89, 18,050.29 and 7,111.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,079.89 : 18,050.29 = 7,111.55 : x
2. Step 2: Convert to fraction form
   13,079.89/18,050.29 = 7,111.55/x
3. Step 3: Cross multiply
   13,079.89x = 18,050.29 × 7,111.55
4. Step 4: Simplify right side
   13,079.89x = 128,365,567.20
5. Step 5: Solve for x
   x = 128,365,567.20/13,079.89
6. Step 6: Final answer
   x = 9,813.97