Finding the Fourth Proportional to 612,150.76, 844,756.50 and 340,215.40

Step by Step Solution

1. Step 1: Write the proportion equation
   612,150.76 : 844,756.50 = 340,215.40 : x
2. Step 2: Convert to fraction form
   612,150.76/844,756.50 = 340,215.40/x
3. Step 3: Cross multiply
   612,150.76x = 844,756.50 × 340,215.40
4. Step 4: Simplify right side
   612,150.76x = 287,399,170,550.10
5. Step 5: Solve for x
   x = 287,399,170,550.10/612,150.76
6. Step 6: Final answer
   x = 469,490.83