Finding the Fourth Proportional to 21,111.55, 31,667.31 and 10,012.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,111.55 : 31,667.31 = 10,012.18 : x
2. Step 2: Convert to fraction form
   21,111.55/31,667.31 = 10,012.18/x
3. Step 3: Cross multiply
   21,111.55x = 31,667.31 × 10,012.18
4. Step 4: Simplify right side
   21,111.55x = 317,058,807.84
5. Step 5: Solve for x
   x = 317,058,807.84/21,111.55
6. Step 6: Final answer
   x = 15,018.26