Finding the Fourth Proportional to 12,787.04, 17,642.40 and 7,409.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,787.04 : 17,642.40 = 7,409.12 : x
2. Step 2: Convert to fraction form
   12,787.04/17,642.40 = 7,409.12/x
3. Step 3: Cross multiply
   12,787.04x = 17,642.40 × 7,409.12
4. Step 4: Simplify right side
   12,787.04x = 130,714,658.69
5. Step 5: Solve for x
   x = 130,714,658.69/12,787.04
6. Step 6: Final answer
   x = 10,222.43