Finding the Fourth Proportional to 1,112.58, 1,666.27 and 879.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.58 : 1,666.27 = 879.91 : x
2. Step 2: Convert to fraction form
   1,112.58/1,666.27 = 879.91/x
3. Step 3: Cross multiply
   1,112.58x = 1,666.27 × 879.91
4. Step 4: Simplify right side
   1,112.58x = 1,466,167.64
5. Step 5: Solve for x
   x = 1,466,167.64/1,112.58
6. Step 6: Final answer
   x = 1,317.81