Finding the Fourth Proportional to 1,178.64, 1,626.44 and 712.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,178.64 : 1,626.44 = 712.72 : x
2. Step 2: Convert to fraction form
   1,178.64/1,626.44 = 712.72/x
3. Step 3: Cross multiply
   1,178.64x = 1,626.44 × 712.72
4. Step 4: Simplify right side
   1,178.64x = 1,159,196.32
5. Step 5: Solve for x
   x = 1,159,196.32/1,178.64
6. Step 6: Final answer
   x = 983.50