Finding the Fourth Proportional to 21,495.17, 29,662.74 and 12,886.22

Step by Step Solution

1. Step 1: Write the proportion equation
   21,495.17 : 29,662.74 = 12,886.22 : x
2. Step 2: Convert to fraction form
   21,495.17/29,662.74 = 12,886.22/x
3. Step 3: Cross multiply
   21,495.17x = 29,662.74 × 12,886.22
4. Step 4: Simplify right side
   21,495.17x = 382,240,667.60
5. Step 5: Solve for x
   x = 382,240,667.60/21,495.17
6. Step 6: Final answer
   x = 17,782.63