Finding the Fourth Proportional to 12,840.86, 17,719.52 and 7,251.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,840.86 : 17,719.52 = 7,251.50 : x
2. Step 2: Convert to fraction form
   12,840.86/17,719.52 = 7,251.50/x
3. Step 3: Cross multiply
   12,840.86x = 17,719.52 × 7,251.50
4. Step 4: Simplify right side
   12,840.86x = 128,493,099.28
5. Step 5: Solve for x
   x = 128,493,099.28/12,840.86
6. Step 6: Final answer
   x = 10,006.58