Finding the Fourth Proportional to 21,510.78, 29,685.06 and 12,080.22

Step by Step Solution

1. Step 1: Write the proportion equation
   21,510.78 : 29,685.06 = 12,080.22 : x
2. Step 2: Convert to fraction form
   21,510.78/29,685.06 = 12,080.22/x
3. Step 3: Cross multiply
   21,510.78x = 29,685.06 × 12,080.22
4. Step 4: Simplify right side
   21,510.78x = 358,602,055.51
5. Step 5: Solve for x
   x = 358,602,055.51/21,510.78
6. Step 6: Final answer
   x = 16,670.81