Finding the Fourth Proportional to 166,442.50, 229,691.46 and 90,991

Step by Step Solution

1. Step 1: Write the proportion equation
   166,442.50 : 229,691.46 = 90,991 : x
2. Step 2: Convert to fraction form
   166,442.50/229,691.46 = 90,991/x
3. Step 3: Cross multiply
   166,442.50x = 229,691.46 × 90,991
4. Step 4: Simplify right side
   166,442.50x = 20,899,855,636.86
5. Step 5: Solve for x
   x = 20,899,855,636.86/166,442.50
6. Step 6: Final answer
   x = 125,568.02