Finding the Fourth Proportional to 1,070.72, 1,607.16 and 722.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,070.72 : 1,607.16 = 722.96 : x
2. Step 2: Convert to fraction form
   1,070.72/1,607.16 = 722.96/x
3. Step 3: Cross multiply
   1,070.72x = 1,607.16 × 722.96
4. Step 4: Simplify right side
   1,070.72x = 1,161,912.39
5. Step 5: Solve for x
   x = 1,161,912.39/1,070.72
6. Step 6: Final answer
   x = 1,085.17