Finding the Fourth Proportional to 9,980.72, 13,774.76 and 6,443.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,980.72 : 13,774.76 = 6,443.25 : x
2. Step 2: Convert to fraction form
   9,980.72/13,774.76 = 6,443.25/x
3. Step 3: Cross multiply
   9,980.72x = 13,774.76 × 6,443.25
4. Step 4: Simplify right side
   9,980.72x = 88,754,162.66
5. Step 5: Solve for x
   x = 88,754,162.66/9,980.72
6. Step 6: Final answer
   x = 8,892.56