Finding the Fourth Proportional to 9,978.21, 13,770.54 and 5,501.95

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.21 : 13,770.54 = 5,501.95 : x
2. Step 2: Convert to fraction form
   9,978.21/13,770.54 = 5,501.95/x
3. Step 3: Cross multiply
   9,978.21x = 13,770.54 × 5,501.95
4. Step 4: Simplify right side
   9,978.21x = 75,764,822.55
5. Step 5: Solve for x
   x = 75,764,822.55/9,978.21
6. Step 6: Final answer
   x = 7,593.03