Finding the Fourth Proportional to 123,796.55, 170,839.94 and 72,811.43

Step by Step Solution

1. Step 1: Write the proportion equation
   123,796.55 : 170,839.94 = 72,811.43 : x
2. Step 2: Convert to fraction form
   123,796.55/170,839.94 = 72,811.43/x
3. Step 3: Cross multiply
   123,796.55x = 170,839.94 × 72,811.43
4. Step 4: Simplify right side
   123,796.55x = 12,439,100,332.51
5. Step 5: Solve for x
   x = 12,439,100,332.51/123,796.55
6. Step 6: Final answer
   x = 100,480.19