Finding the Fourth Proportional to 1,017.10, 1,403.99 and 768.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.10 : 1,403.99 = 768.32 : x
2. Step 2: Convert to fraction form
   1,017.10/1,403.99 = 768.32/x
3. Step 3: Cross multiply
   1,017.10x = 1,403.99 × 768.32
4. Step 4: Simplify right side
   1,017.10x = 1,078,709.76
5. Step 5: Solve for x
   x = 1,078,709.76/1,017.10
6. Step 6: Final answer
   x = 1,060.58