Finding the Fourth Proportional to 1,165.25, 1,607.89 and 693.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,165.25 : 1,607.89 = 693.15 : x
2. Step 2: Convert to fraction form
   1,165.25/1,607.89 = 693.15/x
3. Step 3: Cross multiply
   1,165.25x = 1,607.89 × 693.15
4. Step 4: Simplify right side
   1,165.25x = 1,114,508.95
5. Step 5: Solve for x
   x = 1,114,508.95/1,165.25
6. Step 6: Final answer
   x = 956.45