Finding the Fourth Proportional to 1,017.12, 1,404.77 and 764.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.12 : 1,404.77 = 764.60 : x
2. Step 2: Convert to fraction form
   1,017.12/1,404.77 = 764.60/x
3. Step 3: Cross multiply
   1,017.12x = 1,404.77 × 764.60
4. Step 4: Simplify right side
   1,017.12x = 1,074,087.14
5. Step 5: Solve for x
   x = 1,074,087.14/1,017.12
6. Step 6: Final answer
   x = 1,056.01