Finding the Fourth Proportional to 21,255.42, 31,868.72 and 11,901.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,255.42 : 31,868.72 = 11,901.88 : x
2. Step 2: Convert to fraction form
   21,255.42/31,868.72 = 11,901.88/x
3. Step 3: Cross multiply
   21,255.42x = 31,868.72 × 11,901.88
4. Step 4: Simplify right side
   21,255.42x = 379,297,681.19
5. Step 5: Solve for x
   x = 379,297,681.19/21,255.42
6. Step 6: Final answer
   x = 17,844.75