Finding the Fourth Proportional to 21,160.01, 29,187.54 and 13,616.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,160.01 : 29,187.54 = 13,616.15 : x
2. Step 2: Convert to fraction form
   21,160.01/29,187.54 = 13,616.15/x
3. Step 3: Cross multiply
   21,160.01x = 29,187.54 × 13,616.15
4. Step 4: Simplify right side
   21,160.01x = 397,421,776.83
5. Step 5: Solve for x
   x = 397,421,776.83/21,160.01
6. Step 6: Final answer
   x = 18,781.74