Finding the Fourth Proportional to 404,903.89, 606,689.41 and 138,518.79

Step by Step Solution

1. Step 1: Write the proportion equation
   404,903.89 : 606,689.41 = 138,518.79 : x
2. Step 2: Convert to fraction form
   404,903.89/606,689.41 = 138,518.79/x
3. Step 3: Cross multiply
   404,903.89x = 606,689.41 × 138,518.79
4. Step 4: Simplify right side
   404,903.89x = 84,037,882,979.01
5. Step 5: Solve for x
   x = 84,037,882,979.01/404,903.89
6. Step 6: Final answer
   x = 207,550.20