Finding the Fourth Proportional to 1,420.31, 1,960.01 and 790.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.31 : 1,960.01 = 790.82 : x
2. Step 2: Convert to fraction form
   1,420.31/1,960.01 = 790.82/x
3. Step 3: Cross multiply
   1,420.31x = 1,960.01 × 790.82
4. Step 4: Simplify right side
   1,420.31x = 1,550,006.25
5. Step 5: Solve for x
   x = 1,550,006.25/1,420.31
6. Step 6: Final answer
   x = 1,091.32