Finding the Fourth Proportional to 1,385.39, 1,911.53 and 787.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.39 : 1,911.53 = 787.82 : x
2. Step 2: Convert to fraction form
   1,385.39/1,911.53 = 787.82/x
3. Step 3: Cross multiply
   1,385.39x = 1,911.53 × 787.82
4. Step 4: Simplify right side
   1,385.39x = 1,505,933.98
5. Step 5: Solve for x
   x = 1,505,933.98/1,385.39
6. Step 6: Final answer
   x = 1,087.01