Finding the Fourth Proportional to 1,071.32, 1,607.96 and 661.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.32 : 1,607.96 = 661.25 : x
2. Step 2: Convert to fraction form
   1,071.32/1,607.96 = 661.25/x
3. Step 3: Cross multiply
   1,071.32x = 1,607.96 × 661.25
4. Step 4: Simplify right side
   1,071.32x = 1,063,269.22
5. Step 5: Solve for x
   x = 1,063,269.22/1,071.32
6. Step 6: Final answer
   x = 992.49