Finding the Fourth Proportional to 1,408.72, 1,944.12 and 787.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.72 : 1,944.12 = 787.72 : x
2. Step 2: Convert to fraction form
   1,408.72/1,944.12 = 787.72/x
3. Step 3: Cross multiply
   1,408.72x = 1,944.12 × 787.72
4. Step 4: Simplify right side
   1,408.72x = 1,531,422.21
5. Step 5: Solve for x
   x = 1,531,422.21/1,408.72
6. Step 6: Final answer
   x = 1,087.10