Finding the Fourth Proportional to 1,419.91, 1,959.57 and 790.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.91 : 1,959.57 = 790.43 : x
2. Step 2: Convert to fraction form
   1,419.91/1,959.57 = 790.43/x
3. Step 3: Cross multiply
   1,419.91x = 1,959.57 × 790.43
4. Step 4: Simplify right side
   1,419.91x = 1,548,889.17
5. Step 5: Solve for x
   x = 1,548,889.17/1,419.91
6. Step 6: Final answer
   x = 1,090.84