Finding the Fourth Proportional to 21,096.81, 29,113.47 and 12,602.79

Step by Step Solution

1. Step 1: Write the proportion equation
   21,096.81 : 29,113.47 = 12,602.79 : x
2. Step 2: Convert to fraction form
   21,096.81/29,113.47 = 12,602.79/x
3. Step 3: Cross multiply
   21,096.81x = 29,113.47 × 12,602.79
4. Step 4: Simplify right side
   21,096.81x = 366,910,948.58
5. Step 5: Solve for x
   x = 366,910,948.58/21,096.81
6. Step 6: Final answer
   x = 17,391.77