Finding the Fourth Proportional to 21,513.86, 29,680.83 and 15,862.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,513.86 : 29,680.83 = 15,862.05 : x
2. Step 2: Convert to fraction form
   21,513.86/29,680.83 = 15,862.05/x
3. Step 3: Cross multiply
   21,513.86x = 29,680.83 × 15,862.05
4. Step 4: Simplify right side
   21,513.86x = 470,798,809.50
5. Step 5: Solve for x
   x = 470,798,809.50/21,513.86
6. Step 6: Final answer
   x = 21,883.51