Finding the Fourth Proportional to 21,180.42, 31,748.76 and 10,079.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,180.42 : 31,748.76 = 10,079.10 : x
2. Step 2: Convert to fraction form
   21,180.42/31,748.76 = 10,079.10/x
3. Step 3: Cross multiply
   21,180.42x = 31,748.76 × 10,079.10
4. Step 4: Simplify right side
   21,180.42x = 319,998,926.92
5. Step 5: Solve for x
   x = 319,998,926.92/21,180.42
6. Step 6: Final answer
   x = 15,108.24