Finding the Fourth Proportional to 557,667.91, 769,568.20 and 312,636.43

Step by Step Solution

1. Step 1: Write the proportion equation
   557,667.91 : 769,568.20 = 312,636.43 : x
2. Step 2: Convert to fraction form
   557,667.91/769,568.20 = 312,636.43/x
3. Step 3: Cross multiply
   557,667.91x = 769,568.20 × 312,636.43
4. Step 4: Simplify right side
   557,667.91x = 240,595,054,689.53
5. Step 5: Solve for x
   x = 240,595,054,689.53/557,667.91
6. Step 6: Final answer
   x = 431,430.70