Finding the Fourth Proportional to 123,318.07, 170,179.72 and 72,320.42

Step by Step Solution

1. Step 1: Write the proportion equation
   123,318.07 : 170,179.72 = 72,320.42 : x
2. Step 2: Convert to fraction form
   123,318.07/170,179.72 = 72,320.42/x
3. Step 3: Cross multiply
   123,318.07x = 170,179.72 × 72,320.42
4. Step 4: Simplify right side
   123,318.07x = 12,307,469,070.53
5. Step 5: Solve for x
   x = 12,307,469,070.53/123,318.07
6. Step 6: Final answer
   x = 99,802.64