Finding the Fourth Proportional to 1,404.21, 2,105.60 and 788.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.21 : 2,105.60 = 788.34 : x
2. Step 2: Convert to fraction form
   1,404.21/2,105.60 = 788.34/x
3. Step 3: Cross multiply
   1,404.21x = 2,105.60 × 788.34
4. Step 4: Simplify right side
   1,404.21x = 1,659,928.70
5. Step 5: Solve for x
   x = 1,659,928.70/1,404.21
6. Step 6: Final answer
   x = 1,182.11