Finding the Fourth Proportional to 1,408.50, 1,943.28 and 911.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.50 : 1,943.28 = 911.52 : x
2. Step 2: Convert to fraction form
   1,408.50/1,943.28 = 911.52/x
3. Step 3: Cross multiply
   1,408.50x = 1,943.28 × 911.52
4. Step 4: Simplify right side
   1,408.50x = 1,771,338.59
5. Step 5: Solve for x
   x = 1,771,338.59/1,408.50
6. Step 6: Final answer
   x = 1,257.61