Finding the Fourth Proportional to 12,821.69, 19,238.49 and 4,921.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,821.69 : 19,238.49 = 4,921.58 : x
2. Step 2: Convert to fraction form
   12,821.69/19,238.49 = 4,921.58/x
3. Step 3: Cross multiply
   12,821.69x = 19,238.49 × 4,921.58
4. Step 4: Simplify right side
   12,821.69x = 94,683,767.61
5. Step 5: Solve for x
   x = 94,683,767.61/12,821.69
6. Step 6: Final answer
   x = 7,384.66