Finding the Fourth Proportional to 9,958.49, 13,742.72 and 5,421.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,958.49 : 13,742.72 = 5,421.15 : x
2. Step 2: Convert to fraction form
   9,958.49/13,742.72 = 5,421.15/x
3. Step 3: Cross multiply
   9,958.49x = 13,742.72 × 5,421.15
4. Step 4: Simplify right side
   9,958.49x = 74,501,346.53
5. Step 5: Solve for x
   x = 74,501,346.53/9,958.49
6. Step 6: Final answer
   x = 7,481.19