Finding the Fourth Proportional to 1,180.58, 1,771.27 and 815.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,180.58 : 1,771.27 = 815.06 : x
2. Step 2: Convert to fraction form
   1,180.58/1,771.27 = 815.06/x
3. Step 3: Cross multiply
   1,180.58x = 1,771.27 × 815.06
4. Step 4: Simplify right side
   1,180.58x = 1,443,693.72
5. Step 5: Solve for x
   x = 1,443,693.72/1,180.58
6. Step 6: Final answer
   x = 1,222.87