Finding the Fourth Proportional to 21,035.78, 29,030.04 and 12,085.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,035.78 : 29,030.04 = 12,085.10 : x
2. Step 2: Convert to fraction form
   21,035.78/29,030.04 = 12,085.10/x
3. Step 3: Cross multiply
   21,035.78x = 29,030.04 × 12,085.10
4. Step 4: Simplify right side
   21,035.78x = 350,830,791.25
5. Step 5: Solve for x
   x = 350,830,791.25/21,035.78
6. Step 6: Final answer
   x = 16,677.82