Finding the Fourth Proportional to 1,289,401.83, 1,934,117.33 and 390,836.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,289,401.83 : 1,934,117.33 = 390,836.43 : x
2. Step 2: Convert to fraction form
   1,289,401.83/1,934,117.33 = 390,836.43/x
3. Step 3: Cross multiply
   1,289,401.83x = 1,934,117.33 × 390,836.43
4. Step 4: Simplify right side
   1,289,401.83x = 755,923,510,504.15
5. Step 5: Solve for x
   x = 755,923,510,504.15/1,289,401.83
6. Step 6: Final answer
   x = 586,259.06