Finding the Fourth Proportional to 2,105.52, 3,156.45 and 788.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.52 : 3,156.45 = 788.39 : x
2. Step 2: Convert to fraction form
   2,105.52/3,156.45 = 788.39/x
3. Step 3: Cross multiply
   2,105.52x = 3,156.45 × 788.39
4. Step 4: Simplify right side
   2,105.52x = 2,488,513.62
5. Step 5: Solve for x
   x = 2,488,513.62/2,105.52
6. Step 6: Final answer
   x = 1,181.90