Finding the Fourth Proportional to 9,906.55, 13,670.99 and 5,430.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,906.55 : 13,670.99 = 5,430.49 : x
2. Step 2: Convert to fraction form
   9,906.55/13,670.99 = 5,430.49/x
3. Step 3: Cross multiply
   9,906.55x = 13,670.99 × 5,430.49
4. Step 4: Simplify right side
   9,906.55x = 74,240,147.33
5. Step 5: Solve for x
   x = 74,240,147.33/9,906.55
6. Step 6: Final answer
   x = 7,494.05