Finding the Fourth Proportional to 13,087.78, 18,060.84 and 7,119.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,087.78 : 18,060.84 = 7,119.50 : x
2. Step 2: Convert to fraction form
   13,087.78/18,060.84 = 7,119.50/x
3. Step 3: Cross multiply
   13,087.78x = 18,060.84 × 7,119.50
4. Step 4: Simplify right side
   13,087.78x = 128,584,060.08
5. Step 5: Solve for x
   x = 128,584,060.08/13,087.78
6. Step 6: Final answer
   x = 9,824.74