Finding the Fourth Proportional to 13,194.78, 18,208.71 and 7,889.82

Step by Step Solution

1. Step 1: Write the proportion equation
   13,194.78 : 18,208.71 = 7,889.82 : x
2. Step 2: Convert to fraction form
   13,194.78/18,208.71 = 7,889.82/x
3. Step 3: Cross multiply
   13,194.78x = 18,208.71 × 7,889.82
4. Step 4: Simplify right side
   13,194.78x = 143,663,444.33
5. Step 5: Solve for x
   x = 143,663,444.33/13,194.78
6. Step 6: Final answer
   x = 10,887.90