Finding the Fourth Proportional to 1,173.40, 1,618.50 and 730.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,173.40 : 1,618.50 = 730.72 : x
2. Step 2: Convert to fraction form
   1,173.40/1,618.50 = 730.72/x
3. Step 3: Cross multiply
   1,173.40x = 1,618.50 × 730.72
4. Step 4: Simplify right side
   1,173.40x = 1,182,670.32
5. Step 5: Solve for x
   x = 1,182,670.32/1,173.40
6. Step 6: Final answer
   x = 1,007.90