Finding the Fourth Proportional to 9,880.74, 13,635.36 and 5,404.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,880.74 : 13,635.36 = 5,404.50 : x
2. Step 2: Convert to fraction form
   9,880.74/13,635.36 = 5,404.50/x
3. Step 3: Cross multiply
   9,880.74x = 13,635.36 × 5,404.50
4. Step 4: Simplify right side
   9,880.74x = 73,692,303.12
5. Step 5: Solve for x
   x = 73,692,303.12/9,880.74
6. Step 6: Final answer
   x = 7,458.18