Finding the Fourth Proportional to 1,214.72, 1,676.88 and 860.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,214.72 : 1,676.88 = 860.94 : x
2. Step 2: Convert to fraction form
   1,214.72/1,676.88 = 860.94/x
3. Step 3: Cross multiply
   1,214.72x = 1,676.88 × 860.94
4. Step 4: Simplify right side
   1,214.72x = 1,443,693.07
5. Step 5: Solve for x
   x = 1,443,693.07/1,214.72
6. Step 6: Final answer
   x = 1,188.50