Finding the Fourth Proportional to 404,436.54, 606,654.74 and 138,199.34

Step by Step Solution

1. Step 1: Write the proportion equation
   404,436.54 : 606,654.74 = 138,199.34 : x
2. Step 2: Convert to fraction form
   404,436.54/606,654.74 = 138,199.34/x
3. Step 3: Cross multiply
   404,436.54x = 606,654.74 × 138,199.34
4. Step 4: Simplify right side
   404,436.54x = 83,839,284,675.87
5. Step 5: Solve for x
   x = 83,839,284,675.87/404,436.54
6. Step 6: Final answer
   x = 207,298.99