Finding the Fourth Proportional to 1,408.24, 1,943.84 and 988.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,408.24 : 1,943.84 = 988.70 : x
2. Step 2: Convert to fraction form
   1,408.24/1,943.84 = 988.70/x
3. Step 3: Cross multiply
   1,408.24x = 1,943.84 × 988.70
4. Step 4: Simplify right side
   1,408.24x = 1,921,869.09
5. Step 5: Solve for x
   x = 1,921,869.09/1,408.24
6. Step 6: Final answer
   x = 1,364.73