Finding the Fourth Proportional to 21,556.01, 29,742.83 and 12,601.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,556.01 : 29,742.83 = 12,601.78 : x
2. Step 2: Convert to fraction form
   21,556.01/29,742.83 = 12,601.78/x
3. Step 3: Cross multiply
   21,556.01x = 29,742.83 × 12,601.78
4. Step 4: Simplify right side
   21,556.01x = 374,812,600.24
5. Step 5: Solve for x
   x = 374,812,600.24/21,556.01
6. Step 6: Final answer
   x = 17,387.85