Finding the Fourth Proportional to 13,077.99, 18,028.58 and 9,928.71

Step by Step Solution

1. Step 1: Write the proportion equation
   13,077.99 : 18,028.58 = 9,928.71 : x
2. Step 2: Convert to fraction form
   13,077.99/18,028.58 = 9,928.71/x
3. Step 3: Cross multiply
   13,077.99x = 18,028.58 × 9,928.71
4. Step 4: Simplify right side
   13,077.99x = 179,000,492.89
5. Step 5: Solve for x
   x = 179,000,492.89/13,077.99
6. Step 6: Final answer
   x = 13,687.16