Finding the Fourth Proportional to 1,145.69, 1,580.86 and 697.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.69 : 1,580.86 = 697.31 : x
2. Step 2: Convert to fraction form
   1,145.69/1,580.86 = 697.31/x
3. Step 3: Cross multiply
   1,145.69x = 1,580.86 × 697.31
4. Step 4: Simplify right side
   1,145.69x = 1,102,346.00
5. Step 5: Solve for x
   x = 1,102,346.00/1,145.69
6. Step 6: Final answer
   x = 962.17