Finding the Fourth Proportional to 21,376.03, 29,499.27 and 12,420.27

Step by Step Solution

1. Step 1: Write the proportion equation
   21,376.03 : 29,499.27 = 12,420.27 : x
2. Step 2: Convert to fraction form
   21,376.03/29,499.27 = 12,420.27/x
3. Step 3: Cross multiply
   21,376.03x = 29,499.27 × 12,420.27
4. Step 4: Simplify right side
   21,376.03x = 366,388,750.71
5. Step 5: Solve for x
   x = 366,388,750.71/21,376.03
6. Step 6: Final answer
   x = 17,140.17