Finding the Fourth Proportional to 1,419.71, 1,959.12 and 790.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.71 : 1,959.12 = 790.20 : x
2. Step 2: Convert to fraction form
   1,419.71/1,959.12 = 790.20/x
3. Step 3: Cross multiply
   1,419.71x = 1,959.12 × 790.20
4. Step 4: Simplify right side
   1,419.71x = 1,548,096.62
5. Step 5: Solve for x
   x = 1,548,096.62/1,419.71
6. Step 6: Final answer
   x = 1,090.44