Finding the Fourth Proportional to 1,422.67, 2,132.79 and 556.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.67 : 2,132.79 = 556.78 : x
2. Step 2: Convert to fraction form
   1,422.67/2,132.79 = 556.78/x
3. Step 3: Cross multiply
   1,422.67x = 2,132.79 × 556.78
4. Step 4: Simplify right side
   1,422.67x = 1,187,494.82
5. Step 5: Solve for x
   x = 1,187,494.82/1,422.67
6. Step 6: Final answer
   x = 834.69