Finding the Fourth Proportional to 13,151.28, 18,151.11 and 7,773.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,151.28 : 18,151.11 = 7,773.50 : x
2. Step 2: Convert to fraction form
   13,151.28/18,151.11 = 7,773.50/x
3. Step 3: Cross multiply
   13,151.28x = 18,151.11 × 7,773.50
4. Step 4: Simplify right side
   13,151.28x = 141,097,653.59
5. Step 5: Solve for x
   x = 141,097,653.59/13,151.28
6. Step 6: Final answer
   x = 10,728.82