Finding the Fourth Proportional to 404,091.94, 601,366.76 and 390,637.04

Step by Step Solution

1. Step 1: Write the proportion equation
   404,091.94 : 601,366.76 = 390,637.04 : x
2. Step 2: Convert to fraction form
   404,091.94/601,366.76 = 390,637.04/x
3. Step 3: Cross multiply
   404,091.94x = 601,366.76 × 390,637.04
4. Step 4: Simplify right side
   404,091.94x = 234,916,131,080.79
5. Step 5: Solve for x
   x = 234,916,131,080.79/404,091.94
6. Step 6: Final answer
   x = 581,343.27