Finding the Fourth Proportional to 8,513.40, 11,748.72 and 5,155.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,513.40 : 11,748.72 = 5,155.50 : x
2. Step 2: Convert to fraction form
   8,513.40/11,748.72 = 5,155.50/x
3. Step 3: Cross multiply
   8,513.40x = 11,748.72 × 5,155.50
4. Step 4: Simplify right side
   8,513.40x = 60,570,525.96
5. Step 5: Solve for x
   x = 60,570,525.96/8,513.40
6. Step 6: Final answer
   x = 7,114.73