Finding the Fourth Proportional to 9,880.79, 13,635.40 and 5,404.57

Step by Step Solution

1. Step 1: Write the proportion equation
   9,880.79 : 13,635.40 = 5,404.57 : x
2. Step 2: Convert to fraction form
   9,880.79/13,635.40 = 5,404.57/x
3. Step 3: Cross multiply
   9,880.79x = 13,635.40 × 5,404.57
4. Step 4: Simplify right side
   9,880.79x = 73,693,446.76
5. Step 5: Solve for x
   x = 73,693,446.76/9,880.79
6. Step 6: Final answer
   x = 7,458.26