Finding the Fourth Proportional to 9,980.70, 14,971.81 and 5,821.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,980.70 : 14,971.81 = 5,821.12 : x
2. Step 2: Convert to fraction form
   9,980.70/14,971.81 = 5,821.12/x
3. Step 3: Cross multiply
   9,980.70x = 14,971.81 × 5,821.12
4. Step 4: Simplify right side
   9,980.70x = 87,152,673.52
5. Step 5: Solve for x
   x = 87,152,673.52/9,980.70
6. Step 6: Final answer
   x = 8,732.12