Finding the Fourth Proportional to 12,402.72, 17,108.93 and 7,857.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,402.72 : 17,108.93 = 7,857.07 : x
2. Step 2: Convert to fraction form
   12,402.72/17,108.93 = 7,857.07/x
3. Step 3: Cross multiply
   12,402.72x = 17,108.93 × 7,857.07
4. Step 4: Simplify right side
   12,402.72x = 134,426,021.35
5. Step 5: Solve for x
   x = 134,426,021.35/12,402.72
6. Step 6: Final answer
   x = 10,838.44