Finding the Fourth Proportional to 9,906.35, 13,670.68 and 5,430.09

Step by Step Solution

1. Step 1: Write the proportion equation
   9,906.35 : 13,670.68 = 5,430.09 : x
2. Step 2: Convert to fraction form
   9,906.35/13,670.68 = 5,430.09/x
3. Step 3: Cross multiply
   9,906.35x = 13,670.68 × 5,430.09
4. Step 4: Simplify right side
   9,906.35x = 74,233,022.76
5. Step 5: Solve for x
   x = 74,233,022.76/9,906.35
6. Step 6: Final answer
   x = 7,493.48