Finding the Fourth Proportional to 1,411.76, 1,948.04 and 790.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.76 : 1,948.04 = 790.80 : x
2. Step 2: Convert to fraction form
   1,411.76/1,948.04 = 790.80/x
3. Step 3: Cross multiply
   1,411.76x = 1,948.04 × 790.80
4. Step 4: Simplify right side
   1,411.76x = 1,540,510.03
5. Step 5: Solve for x
   x = 1,540,510.03/1,411.76
6. Step 6: Final answer
   x = 1,091.20