Finding the Fourth Proportional to 1,109.23, 1,528.88 and 859.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.23 : 1,528.88 = 859.55 : x
2. Step 2: Convert to fraction form
   1,109.23/1,528.88 = 859.55/x
3. Step 3: Cross multiply
   1,109.23x = 1,528.88 × 859.55
4. Step 4: Simplify right side
   1,109.23x = 1,314,136.86
5. Step 5: Solve for x
   x = 1,314,136.86/1,109.23
6. Step 6: Final answer
   x = 1,184.73