Finding the Fourth Proportional to 694,990, 959,079.72 and 393,184

Step by Step Solution

1. Step 1: Write the proportion equation
   694,990 : 959,079.72 = 393,184 : x
2. Step 2: Convert to fraction form
   694,990/959,079.72 = 393,184/x
3. Step 3: Cross multiply
   694,990x = 959,079.72 × 393,184
4. Step 4: Simplify right side
   694,990x = 377,094,800,628.48
5. Step 5: Solve for x
   x = 377,094,800,628.48/694,990
6. Step 6: Final answer
   x = 542,590.25