Finding the Fourth Proportional to 690,667.98, 1,036,150.20 and 391,291.98

Step by Step Solution

1. Step 1: Write the proportion equation
   690,667.98 : 1,036,150.20 = 391,291.98 : x
2. Step 2: Convert to fraction form
   690,667.98/1,036,150.20 = 391,291.98/x
3. Step 3: Cross multiply
   690,667.98x = 1,036,150.20 × 391,291.98
4. Step 4: Simplify right side
   690,667.98x = 405,437,263,335.40
5. Step 5: Solve for x
   x = 405,437,263,335.40/690,667.98
6. Step 6: Final answer
   x = 587,021.95