Finding the Fourth Proportional to 1,071.72, 1,609.98 and 707.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.72 : 1,609.98 = 707.22 : x
2. Step 2: Convert to fraction form
   1,071.72/1,609.98 = 707.22/x
3. Step 3: Cross multiply
   1,071.72x = 1,609.98 × 707.22
4. Step 4: Simplify right side
   1,071.72x = 1,138,610.06
5. Step 5: Solve for x
   x = 1,138,610.06/1,071.72
6. Step 6: Final answer
   x = 1,062.41