Finding the Fourth Proportional to 9,980.20, 14,971.05 and 5,820.62

Step by Step Solution

1. Step 1: Write the proportion equation
   9,980.20 : 14,971.05 = 5,820.62 : x
2. Step 2: Convert to fraction form
   9,980.20/14,971.05 = 5,820.62/x
3. Step 3: Cross multiply
   9,980.20x = 14,971.05 × 5,820.62
4. Step 4: Simplify right side
   9,980.20x = 87,140,776.67
5. Step 5: Solve for x
   x = 87,140,776.67/9,980.20
6. Step 6: Final answer
   x = 8,731.37