Finding the Fourth Proportional to 8,499.60, 11,729.70 and 5,143.01

Step by Step Solution

1. Step 1: Write the proportion equation
   8,499.60 : 11,729.70 = 5,143.01 : x
2. Step 2: Convert to fraction form
   8,499.60/11,729.70 = 5,143.01/x
3. Step 3: Cross multiply
   8,499.60x = 11,729.70 × 5,143.01
4. Step 4: Simplify right side
   8,499.60x = 60,325,905.75
5. Step 5: Solve for x
   x = 60,325,905.75/8,499.60
6. Step 6: Final answer
   x = 7,097.50