Finding the Fourth Proportional to 21,106.16, 31,674.82 and 10,012.90

Step by Step Solution

1. Step 1: Write the proportion equation
   21,106.16 : 31,674.82 = 10,012.90 : x
2. Step 2: Convert to fraction form
   21,106.16/31,674.82 = 10,012.90/x
3. Step 3: Cross multiply
   21,106.16x = 31,674.82 × 10,012.90
4. Step 4: Simplify right side
   21,106.16x = 317,156,805.18
5. Step 5: Solve for x
   x = 317,156,805.18/21,106.16
6. Step 6: Final answer
   x = 15,026.74