Finding the Fourth Proportional to 9,980.37, 13,773.53 and 5,732.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,980.37 : 13,773.53 = 5,732.78 : x
2. Step 2: Convert to fraction form
   9,980.37/13,773.53 = 5,732.78/x
3. Step 3: Cross multiply
   9,980.37x = 13,773.53 × 5,732.78
4. Step 4: Simplify right side
   9,980.37x = 78,960,562.78
5. Step 5: Solve for x
   x = 78,960,562.78/9,980.37
6. Step 6: Final answer
   x = 7,911.59