Finding the Fourth Proportional to 13,189.52, 18,203.69 and 7,887.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,189.52 : 18,203.69 = 7,887.47 : x
2. Step 2: Convert to fraction form
   13,189.52/18,203.69 = 7,887.47/x
3. Step 3: Cross multiply
   13,189.52x = 18,203.69 × 7,887.47
4. Step 4: Simplify right side
   13,189.52x = 143,580,928.31
5. Step 5: Solve for x
   x = 143,580,928.31/13,189.52
6. Step 6: Final answer
   x = 10,885.99