Finding the Fourth Proportional to 1,379.27, 2,068.71 and 556.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.27 : 2,068.71 = 556.91 : x
2. Step 2: Convert to fraction form
   1,379.27/2,068.71 = 556.91/x
3. Step 3: Cross multiply
   1,379.27x = 2,068.71 × 556.91
4. Step 4: Simplify right side
   1,379.27x = 1,152,074.94
5. Step 5: Solve for x
   x = 1,152,074.94/1,379.27
6. Step 6: Final answer
   x = 835.28