Finding the Fourth Proportional to 1,171.50, 1,618.85 and 1,012.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.50 : 1,618.85 = 1,012.94 : x
2. Step 2: Convert to fraction form
   1,171.50/1,618.85 = 1,012.94/x
3. Step 3: Cross multiply
   1,171.50x = 1,618.85 × 1,012.94
4. Step 4: Simplify right side
   1,171.50x = 1,639,798.43
5. Step 5: Solve for x
   x = 1,639,798.43/1,171.50
6. Step 6: Final answer
   x = 1,399.75