Finding the Fourth Proportional to 422,986.50, 634,411.71 and 123,396.66

Step by Step Solution

1. Step 1: Write the proportion equation
   422,986.50 : 634,411.71 = 123,396.66 : x
2. Step 2: Convert to fraction form
   422,986.50/634,411.71 = 123,396.66/x
3. Step 3: Cross multiply
   422,986.50x = 634,411.71 × 123,396.66
4. Step 4: Simplify right side
   422,986.50x = 78,284,286,078.89
5. Step 5: Solve for x
   x = 78,284,286,078.89/422,986.50
6. Step 6: Final answer
   x = 185,075.14