Finding the Fourth Proportional to 89,166.52, 133,916.28 and 78,496.64

Step by Step Solution

1. Step 1: Write the proportion equation
   89,166.52 : 133,916.28 = 78,496.64 : x
2. Step 2: Convert to fraction form
   89,166.52/133,916.28 = 78,496.64/x
3. Step 3: Cross multiply
   89,166.52x = 133,916.28 × 78,496.64
4. Step 4: Simplify right side
   89,166.52x = 10,511,978,021.30
5. Step 5: Solve for x
   x = 10,511,978,021.30/89,166.52
6. Step 6: Final answer
   x = 117,891.54