Finding the Fourth Proportional to 9,880.47, 13,634.86 and 5,404.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,880.47 : 13,634.86 = 5,404.21 : x
2. Step 2: Convert to fraction form
   9,880.47/13,634.86 = 5,404.21/x
3. Step 3: Cross multiply
   9,880.47x = 13,634.86 × 5,404.21
4. Step 4: Simplify right side
   9,880.47x = 73,685,646.76
5. Step 5: Solve for x
   x = 73,685,646.76/9,880.47
6. Step 6: Final answer
   x = 7,457.71