Finding the Fourth Proportional to 21,307.39, 29,404.30 and 12,360.19

Step by Step Solution

1. Step 1: Write the proportion equation
   21,307.39 : 29,404.30 = 12,360.19 : x
2. Step 2: Convert to fraction form
   21,307.39/29,404.30 = 12,360.19/x
3. Step 3: Cross multiply
   21,307.39x = 29,404.30 × 12,360.19
4. Step 4: Simplify right side
   21,307.39x = 363,442,734.82
5. Step 5: Solve for x
   x = 363,442,734.82/21,307.39
6. Step 6: Final answer
   x = 17,057.12