Finding the Fourth Proportional to 1,171.25, 1,611.55 and 1,074.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.25 : 1,611.55 = 1,074.05 : x
2. Step 2: Convert to fraction form
   1,171.25/1,611.55 = 1,074.05/x
3. Step 3: Cross multiply
   1,171.25x = 1,611.55 × 1,074.05
4. Step 4: Simplify right side
   1,171.25x = 1,730,885.28
5. Step 5: Solve for x
   x = 1,730,885.28/1,171.25
6. Step 6: Final answer
   x = 1,477.81