Finding the Fourth Proportional to 1,517.25, 2,271.78 and 785.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,517.25 : 2,271.78 = 785.31 : x
2. Step 2: Convert to fraction form
   1,517.25/2,271.78 = 785.31/x
3. Step 3: Cross multiply
   1,517.25x = 2,271.78 × 785.31
4. Step 4: Simplify right side
   1,517.25x = 1,784,051.55
5. Step 5: Solve for x
   x = 1,784,051.55/1,517.25
6. Step 6: Final answer
   x = 1,175.85