Finding the Fourth Proportional to 123,231.12, 170,102.52 and 72,930

Step by Step Solution

1. Step 1: Write the proportion equation
   123,231.12 : 170,102.52 = 72,930 : x
2. Step 2: Convert to fraction form
   123,231.12/170,102.52 = 72,930/x
3. Step 3: Cross multiply
   123,231.12x = 170,102.52 × 72,930
4. Step 4: Simplify right side
   123,231.12x = 12,405,576,783.60
5. Step 5: Solve for x
   x = 12,405,576,783.60/123,231.12
6. Step 6: Final answer
   x = 100,669.19