Finding the Fourth Proportional to 9,980.04, 13,774.14 and 5,790.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,980.04 : 13,774.14 = 5,790.72 : x
2. Step 2: Convert to fraction form
   9,980.04/13,774.14 = 5,790.72/x
3. Step 3: Cross multiply
   9,980.04x = 13,774.14 × 5,790.72
4. Step 4: Simplify right side
   9,980.04x = 79,762,187.98
5. Step 5: Solve for x
   x = 79,762,187.98/9,980.04
6. Step 6: Final answer
   x = 7,992.17