Finding the Fourth Proportional to 9,899.08, 13,660.72 and 5,423.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,899.08 : 13,660.72 = 5,423.15 : x
2. Step 2: Convert to fraction form
   9,899.08/13,660.72 = 5,423.15/x
3. Step 3: Cross multiply
   9,899.08x = 13,660.72 × 5,423.15
4. Step 4: Simplify right side
   9,899.08x = 74,084,154.26
5. Step 5: Solve for x
   x = 74,084,154.26/9,899.08
6. Step 6: Final answer
   x = 7,483.95