Finding the Fourth Proportional to 1,420.42, 1,960.86 and 1,105.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.42 : 1,960.86 = 1,105.06 : x
2. Step 2: Convert to fraction form
   1,420.42/1,960.86 = 1,105.06/x
3. Step 3: Cross multiply
   1,420.42x = 1,960.86 × 1,105.06
4. Step 4: Simplify right side
   1,420.42x = 2,166,867.95
5. Step 5: Solve for x
   x = 2,166,867.95/1,420.42
6. Step 6: Final answer
   x = 1,525.51