Finding the Fourth Proportional to 611,978.50, 844,609.53 and 343,706.50

Step by Step Solution

1. Step 1: Write the proportion equation
   611,978.50 : 844,609.53 = 343,706.50 : x
2. Step 2: Convert to fraction form
   611,978.50/844,609.53 = 343,706.50/x
3. Step 3: Cross multiply
   611,978.50x = 844,609.53 × 343,706.50
4. Step 4: Simplify right side
   611,978.50x = 290,297,785,422.95
5. Step 5: Solve for x
   x = 290,297,785,422.95/611,978.50
6. Step 6: Final answer
   x = 474,359.45