Finding the Fourth Proportional to 1,357.55, 1,872.72 and 859.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.55 : 1,872.72 = 859.34 : x
2. Step 2: Convert to fraction form
   1,357.55/1,872.72 = 859.34/x
3. Step 3: Cross multiply
   1,357.55x = 1,872.72 × 859.34
4. Step 4: Simplify right side
   1,357.55x = 1,609,303.20
5. Step 5: Solve for x
   x = 1,609,303.20/1,357.55
6. Step 6: Final answer
   x = 1,185.45