Finding the Fourth Proportional to 12,739.84, 19,111.86 and 3,972.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,739.84 : 19,111.86 = 3,972.98 : x
2. Step 2: Convert to fraction form
   12,739.84/19,111.86 = 3,972.98/x
3. Step 3: Cross multiply
   12,739.84x = 19,111.86 × 3,972.98
4. Step 4: Simplify right side
   12,739.84x = 75,931,037.54
5. Step 5: Solve for x
   x = 75,931,037.54/12,739.84
6. Step 6: Final answer
   x = 5,960.12