Finding the Fourth Proportional to 2,636.42, 3,954.84 and 787.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,636.42 : 3,954.84 = 787.40 : x
2. Step 2: Convert to fraction form
   2,636.42/3,954.84 = 787.40/x
3. Step 3: Cross multiply
   2,636.42x = 3,954.84 × 787.40
4. Step 4: Simplify right side
   2,636.42x = 3,114,041.02
5. Step 5: Solve for x
   x = 3,114,041.02/2,636.42
6. Step 6: Final answer
   x = 1,181.16