Finding the Fourth Proportional to 2,636.89, 3,955.53 and 787.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.89 : 3,955.53 = 787.86 : x
2. Step 2: Convert to fraction form
   2,636.89/3,955.53 = 787.86/x
3. Step 3: Cross multiply
   2,636.89x = 3,955.53 × 787.86
4. Step 4: Simplify right side
   2,636.89x = 3,116,406.82
5. Step 5: Solve for x
   x = 3,116,406.82/2,636.89
6. Step 6: Final answer
   x = 1,181.85