Finding the Fourth Proportional to 144,836.16, 199,815.69 and 90,356.23

Step by Step Solution

1. Step 1: Write the proportion equation
   144,836.16 : 199,815.69 = 90,356.23 : x
2. Step 2: Convert to fraction form
   144,836.16/199,815.69 = 90,356.23/x
3. Step 3: Cross multiply
   144,836.16x = 199,815.69 × 90,356.23
4. Step 4: Simplify right side
   144,836.16x = 18,054,592,443.25
5. Step 5: Solve for x
   x = 18,054,592,443.25/144,836.16
6. Step 6: Final answer
   x = 124,655.28