Finding the Fourth Proportional to 123,889.78, 170,953.38 and 72,891.29

Step by Step Solution

1. Step 1: Write the proportion equation
   123,889.78 : 170,953.38 = 72,891.29 : x
2. Step 2: Convert to fraction form
   123,889.78/170,953.38 = 72,891.29/x
3. Step 3: Cross multiply
   123,889.78x = 170,953.38 × 72,891.29
4. Step 4: Simplify right side
   123,889.78x = 12,461,012,398.06
5. Step 5: Solve for x
   x = 12,461,012,398.06/123,889.78
6. Step 6: Final answer
   x = 100,581.44