Finding the Fourth Proportional to 8,428.98, 12,642.71 and 3,749.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,428.98 : 12,642.71 = 3,749.21 : x
2. Step 2: Convert to fraction form
   8,428.98/12,642.71 = 3,749.21/x
3. Step 3: Cross multiply
   8,428.98x = 12,642.71 × 3,749.21
4. Step 4: Simplify right side
   8,428.98x = 47,400,092.80
5. Step 5: Solve for x
   x = 47,400,092.80/8,428.98
6. Step 6: Final answer
   x = 5,623.47