Finding the Fourth Proportional to 13,079.61, 18,050.60 and 7,111.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,079.61 : 18,050.60 = 7,111.15 : x
2. Step 2: Convert to fraction form
   13,079.61/18,050.60 = 7,111.15/x
3. Step 3: Cross multiply
   13,079.61x = 18,050.60 × 7,111.15
4. Step 4: Simplify right side
   13,079.61x = 128,360,598.38
5. Step 5: Solve for x
   x = 128,360,598.38/13,079.61
6. Step 6: Final answer
   x = 9,813.79