Finding the Fourth Proportional to 12,884.72, 17,779.38 and 7,219.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,884.72 : 17,779.38 = 7,219.76 : x
2. Step 2: Convert to fraction form
   12,884.72/17,779.38 = 7,219.76/x
3. Step 3: Cross multiply
   12,884.72x = 17,779.38 × 7,219.76
4. Step 4: Simplify right side
   12,884.72x = 128,362,856.55
5. Step 5: Solve for x
   x = 128,362,856.55/12,884.72
6. Step 6: Final answer
   x = 9,962.41