Finding the Fourth Proportional to 1,420.06, 1,959.04 and 860.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.06 : 1,959.04 = 860.16 : x
2. Step 2: Convert to fraction form
   1,420.06/1,959.04 = 860.16/x
3. Step 3: Cross multiply
   1,420.06x = 1,959.04 × 860.16
4. Step 4: Simplify right side
   1,420.06x = 1,685,087.85
5. Step 5: Solve for x
   x = 1,685,087.85/1,420.06
6. Step 6: Final answer
   x = 1,186.63