Finding the Fourth Proportional to 1,420.32, 1,960.17 and 790.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.32 : 1,960.17 = 790.92 : x
2. Step 2: Convert to fraction form
   1,420.32/1,960.17 = 790.92/x
3. Step 3: Cross multiply
   1,420.32x = 1,960.17 × 790.92
4. Step 4: Simplify right side
   1,420.32x = 1,550,337.66
5. Step 5: Solve for x
   x = 1,550,337.66/1,420.32
6. Step 6: Final answer
   x = 1,091.54