Finding the Fourth Proportional to 9,861.35, 13,608.05 and 5,384.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,861.35 : 13,608.05 = 5,384.21 : x
2. Step 2: Convert to fraction form
   9,861.35/13,608.05 = 5,384.21/x
3. Step 3: Cross multiply
   9,861.35x = 13,608.05 × 5,384.21
4. Step 4: Simplify right side
   9,861.35x = 73,268,503.93
5. Step 5: Solve for x
   x = 73,268,503.93/9,861.35
6. Step 6: Final answer
   x = 7,429.87