Finding the Fourth Proportional to 9,991.43, 14,982.78 and 5,310.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,991.43 : 14,982.78 = 5,310.31 : x
2. Step 2: Convert to fraction form
   9,991.43/14,982.78 = 5,310.31/x
3. Step 3: Cross multiply
   9,991.43x = 14,982.78 × 5,310.31
4. Step 4: Simplify right side
   9,991.43x = 79,563,206.46
5. Step 5: Solve for x
   x = 79,563,206.46/9,991.43
6. Step 6: Final answer
   x = 7,963.15