Finding the Fourth Proportional to 1,420.32, 1,960 and 790.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.32 : 1,960 = 790.82 : x
2. Step 2: Convert to fraction form
   1,420.32/1,960 = 790.82/x
3. Step 3: Cross multiply
   1,420.32x = 1,960 × 790.82
4. Step 4: Simplify right side
   1,420.32x = 1,550,007.20
5. Step 5: Solve for x
   x = 1,550,007.20/1,420.32
6. Step 6: Final answer
   x = 1,091.31