Finding the Fourth Proportional to 1,384.89, 1,911.27 and 787.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.89 : 1,911.27 = 787.57 : x
2. Step 2: Convert to fraction form
   1,384.89/1,911.27 = 787.57/x
3. Step 3: Cross multiply
   1,384.89x = 1,911.27 × 787.57
4. Step 4: Simplify right side
   1,384.89x = 1,505,262.30
5. Step 5: Solve for x
   x = 1,505,262.30/1,384.89
6. Step 6: Final answer
   x = 1,086.92