Finding the Fourth Proportional to 12,938.72, 17,855.36 and 7,902.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,938.72 : 17,855.36 = 7,902.24 : x
2. Step 2: Convert to fraction form
   12,938.72/17,855.36 = 7,902.24/x
3. Step 3: Cross multiply
   12,938.72x = 17,855.36 × 7,902.24
4. Step 4: Simplify right side
   12,938.72x = 141,097,385.83
5. Step 5: Solve for x
   x = 141,097,385.83/12,938.72
6. Step 6: Final answer
   x = 10,905.05