Finding the Fourth Proportional to 12,942.96, 17,855.28 and 7,903.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,942.96 : 17,855.28 = 7,903.20 : x
2. Step 2: Convert to fraction form
   12,942.96/17,855.28 = 7,903.20/x
3. Step 3: Cross multiply
   12,942.96x = 17,855.28 × 7,903.20
4. Step 4: Simplify right side
   12,942.96x = 141,113,848.90
5. Step 5: Solve for x
   x = 141,113,848.90/12,942.96
6. Step 6: Final answer
   x = 10,902.75