Finding the Fourth Proportional to 1,405.33, 2,103.54 and 787.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.33 : 2,103.54 = 787.15 : x
2. Step 2: Convert to fraction form
   1,405.33/2,103.54 = 787.15/x
3. Step 3: Cross multiply
   1,405.33x = 2,103.54 × 787.15
4. Step 4: Simplify right side
   1,405.33x = 1,655,801.19
5. Step 5: Solve for x
   x = 1,655,801.19/1,405.33
6. Step 6: Final answer
   x = 1,178.23