Finding the Fourth Proportional to 123,801.20, 170,846.37 and 72,816.09

Step by Step Solution

1. Step 1: Write the proportion equation
   123,801.20 : 170,846.37 = 72,816.09 : x
2. Step 2: Convert to fraction form
   123,801.20/170,846.37 = 72,816.09/x
3. Step 3: Cross multiply
   123,801.20x = 170,846.37 × 72,816.09
4. Step 4: Simplify right side
   123,801.20x = 12,440,364,654.09
5. Step 5: Solve for x
   x = 12,440,364,654.09/123,801.20
6. Step 6: Final answer
   x = 100,486.62