Finding the Fourth Proportional to 1,172.56, 1,617.38 and 700.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.56 : 1,617.38 = 700.12 : x
2. Step 2: Convert to fraction form
   1,172.56/1,617.38 = 700.12/x
3. Step 3: Cross multiply
   1,172.56x = 1,617.38 × 700.12
4. Step 4: Simplify right side
   1,172.56x = 1,132,360.09
5. Step 5: Solve for x
   x = 1,132,360.09/1,172.56
6. Step 6: Final answer
   x = 965.72