Finding the Fourth Proportional to 1,017.60, 1,404.71 and 768.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.60 : 1,404.71 = 768.99 : x
2. Step 2: Convert to fraction form
   1,017.60/1,404.71 = 768.99/x
3. Step 3: Cross multiply
   1,017.60x = 1,404.71 × 768.99
4. Step 4: Simplify right side
   1,017.60x = 1,080,212.25
5. Step 5: Solve for x
   x = 1,080,212.25/1,017.60
6. Step 6: Final answer
   x = 1,061.53