Finding the Fourth Proportional to 8,469.72, 11,690.40 and 5,112.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,469.72 : 11,690.40 = 5,112.72 : x
2. Step 2: Convert to fraction form
   8,469.72/11,690.40 = 5,112.72/x
3. Step 3: Cross multiply
   8,469.72x = 11,690.40 × 5,112.72
4. Step 4: Simplify right side
   8,469.72x = 59,769,741.89
5. Step 5: Solve for x
   x = 59,769,741.89/8,469.72
6. Step 6: Final answer
   x = 7,056.87