Finding the Fourth Proportional to 12,787.72, 17,647.86 and 7,199.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,787.72 : 17,647.86 = 7,199.08 : x
2. Step 2: Convert to fraction form
   12,787.72/17,647.86 = 7,199.08/x
3. Step 3: Cross multiply
   12,787.72x = 17,647.86 × 7,199.08
4. Step 4: Simplify right side
   12,787.72x = 127,048,355.97
5. Step 5: Solve for x
   x = 127,048,355.97/12,787.72
6. Step 6: Final answer
   x = 9,935.18