Finding the Fourth Proportional to 123,890.78, 170,954.76 and 72,892.29

Step by Step Solution

1. Step 1: Write the proportion equation
   123,890.78 : 170,954.76 = 72,892.29 : x
2. Step 2: Convert to fraction form
   123,890.78/170,954.76 = 72,892.29/x
3. Step 3: Cross multiply
   123,890.78x = 170,954.76 × 72,892.29
4. Step 4: Simplify right side
   123,890.78x = 12,461,283,942.80
5. Step 5: Solve for x
   x = 12,461,283,942.80/123,890.78
6. Step 6: Final answer
   x = 100,582.82