Finding the Fourth Proportional to 13,200.53, 18,216.72 and 7,896.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,200.53 : 18,216.72 = 7,896.60 : x
2. Step 2: Convert to fraction form
   13,200.53/18,216.72 = 7,896.60/x
3. Step 3: Cross multiply
   13,200.53x = 18,216.72 × 7,896.60
4. Step 4: Simplify right side
   13,200.53x = 143,850,060.07
5. Step 5: Solve for x
   x = 143,850,060.07/13,200.53
6. Step 6: Final answer
   x = 10,897.30