Finding the Fourth Proportional to 1,200.72, 1,657.56 and 703.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.72 : 1,657.56 = 703.20 : x
2. Step 2: Convert to fraction form
   1,200.72/1,657.56 = 703.20/x
3. Step 3: Cross multiply
   1,200.72x = 1,657.56 × 703.20
4. Step 4: Simplify right side
   1,200.72x = 1,165,596.19
5. Step 5: Solve for x
   x = 1,165,596.19/1,200.72
6. Step 6: Final answer
   x = 970.75