Finding the Fourth Proportional to 1,174.04, 1,618.91 and 989.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,174.04 : 1,618.91 = 989.56 : x
2. Step 2: Convert to fraction form
   1,174.04/1,618.91 = 989.56/x
3. Step 3: Cross multiply
   1,174.04x = 1,618.91 × 989.56
4. Step 4: Simplify right side
   1,174.04x = 1,602,003.30
5. Step 5: Solve for x
   x = 1,602,003.30/1,174.04
6. Step 6: Final answer
   x = 1,364.53