Finding the Fourth Proportional to 2,636.60, 3,955.46 and 787.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.60 : 3,955.46 = 787.86 : x
2. Step 2: Convert to fraction form
   2,636.60/3,955.46 = 787.86/x
3. Step 3: Cross multiply
   2,636.60x = 3,955.46 × 787.86
4. Step 4: Simplify right side
   2,636.60x = 3,116,348.72
5. Step 5: Solve for x
   x = 3,116,348.72/2,636.60
6. Step 6: Final answer
   x = 1,181.96