Finding the Fourth Proportional to 404,429.94, 606,716.22 and 138,128.04

Step by Step Solution

1. Step 1: Write the proportion equation
   404,429.94 : 606,716.22 = 138,128.04 : x
2. Step 2: Convert to fraction form
   404,429.94/606,716.22 = 138,128.04/x
3. Step 3: Cross multiply
   404,429.94x = 606,716.22 × 138,128.04
4. Step 4: Simplify right side
   404,429.94x = 83,804,522,304.81
5. Step 5: Solve for x
   x = 83,804,522,304.81/404,429.94
6. Step 6: Final answer
   x = 207,216.42