Finding the Fourth Proportional to 11,987.94, 17,981.80 and 3,667.92

Step by Step Solution

1. Step 1: Write the proportion equation
   11,987.94 : 17,981.80 = 3,667.92 : x
2. Step 2: Convert to fraction form
   11,987.94/17,981.80 = 3,667.92/x
3. Step 3: Cross multiply
   11,987.94x = 17,981.80 × 3,667.92
4. Step 4: Simplify right side
   11,987.94x = 65,955,803.86
5. Step 5: Solve for x
   x = 65,955,803.86/11,987.94
6. Step 6: Final answer
   x = 5,501.85