Finding the Fourth Proportional to 21,510.76, 29,684.64 and 12,079.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,510.76 : 29,684.64 = 12,079.12 : x
2. Step 2: Convert to fraction form
   21,510.76/29,684.64 = 12,079.12/x
3. Step 3: Cross multiply
   21,510.76x = 29,684.64 × 12,079.12
4. Step 4: Simplify right side
   21,510.76x = 358,564,328.72
5. Step 5: Solve for x
   x = 358,564,328.72/21,510.76
6. Step 6: Final answer
   x = 16,669.07