Finding the Fourth Proportional to 1,411.31, 1,947.59 and 790.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.31 : 1,947.59 = 790.31 : x
2. Step 2: Convert to fraction form
   1,411.31/1,947.59 = 790.31/x
3. Step 3: Cross multiply
   1,411.31x = 1,947.59 × 790.31
4. Step 4: Simplify right side
   1,411.31x = 1,539,190.11
5. Step 5: Solve for x
   x = 1,539,190.11/1,411.31
6. Step 6: Final answer
   x = 1,090.61