Finding the Fourth Proportional to 12,688.90, 19,033.89 and 3,923.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688.90 : 19,033.89 = 3,923.98 : x
2. Step 2: Convert to fraction form
   12,688.90/19,033.89 = 3,923.98/x
3. Step 3: Cross multiply
   12,688.90x = 19,033.89 × 3,923.98
4. Step 4: Simplify right side
   12,688.90x = 74,688,603.68
5. Step 5: Solve for x
   x = 74,688,603.68/12,688.90
6. Step 6: Final answer
   x = 5,886.14