Finding the Fourth Proportional to 21,835.72, 30,134.10 and 12,405.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,835.72 : 30,134.10 = 12,405.88 : x
2. Step 2: Convert to fraction form
   21,835.72/30,134.10 = 12,405.88/x
3. Step 3: Cross multiply
   21,835.72x = 30,134.10 × 12,405.88
4. Step 4: Simplify right side
   21,835.72x = 373,840,028.51
5. Step 5: Solve for x
   x = 373,840,028.51/21,835.72
6. Step 6: Final answer
   x = 17,120.57