Finding the Fourth Proportional to 21,367.71, 29,485.30 and 12,415.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,367.71 : 29,485.30 = 12,415.59 : x
2. Step 2: Convert to fraction form
   21,367.71/29,485.30 = 12,415.59/x
3. Step 3: Cross multiply
   21,367.71x = 29,485.30 × 12,415.59
4. Step 4: Simplify right side
   21,367.71x = 366,077,395.83
5. Step 5: Solve for x
   x = 366,077,395.83/21,367.71
6. Step 6: Final answer
   x = 17,132.27