Finding the Fourth Proportional to 1,050.64, 1,446.72 and 718.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,050.64 : 1,446.72 = 718.50 : x
2. Step 2: Convert to fraction form
   1,050.64/1,446.72 = 718.50/x
3. Step 3: Cross multiply
   1,050.64x = 1,446.72 × 718.50
4. Step 4: Simplify right side
   1,050.64x = 1,039,468.32
5. Step 5: Solve for x
   x = 1,039,468.32/1,050.64
6. Step 6: Final answer
   x = 989.37