Finding the Fourth Proportional to 1,411.60, 1,947.84 and 790.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.60 : 1,947.84 = 790.56 : x
2. Step 2: Convert to fraction form
   1,411.60/1,947.84 = 790.56/x
3. Step 3: Cross multiply
   1,411.60x = 1,947.84 × 790.56
4. Step 4: Simplify right side
   1,411.60x = 1,539,884.39
5. Step 5: Solve for x
   x = 1,539,884.39/1,411.60
6. Step 6: Final answer
   x = 1,090.88