Finding the Fourth Proportional to 123,164.26, 169,968.57 and 72,164.80

Step by Step Solution

1. Step 1: Write the proportion equation
   123,164.26 : 169,968.57 = 72,164.80 : x
2. Step 2: Convert to fraction form
   123,164.26/169,968.57 = 72,164.80/x
3. Step 3: Cross multiply
   123,164.26x = 169,968.57 × 72,164.80
4. Step 4: Simplify right side
   123,164.26x = 12,265,747,860.34
5. Step 5: Solve for x
   x = 12,265,747,860.34/123,164.26
6. Step 6: Final answer
   x = 99,588.53