Finding the Fourth Proportional to 123,424.02, 170,197.74 and 105,578.10

Step by Step Solution

1. Step 1: Write the proportion equation
   123,424.02 : 170,197.74 = 105,578.10 : x
2. Step 2: Convert to fraction form
   123,424.02/170,197.74 = 105,578.10/x
3. Step 3: Cross multiply
   123,424.02x = 170,197.74 × 105,578.10
4. Step 4: Simplify right side
   123,424.02x = 17,969,154,013.49
5. Step 5: Solve for x
   x = 17,969,154,013.49/123,424.02
6. Step 6: Final answer
   x = 145,588.79