Finding the Fourth Proportional to 9,978.18, 13,768.97 and 5,500.81

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.18 : 13,768.97 = 5,500.81 : x
2. Step 2: Convert to fraction form
   9,978.18/13,768.97 = 5,500.81/x
3. Step 3: Cross multiply
   9,978.18x = 13,768.97 × 5,500.81
4. Step 4: Simplify right side
   9,978.18x = 75,740,419.02
5. Step 5: Solve for x
   x = 75,740,419.02/9,978.18
6. Step 6: Final answer
   x = 7,590.60