Finding the Fourth Proportional to 12,989.69, 19,479.74 and 4,667.47

Step by Step Solution

1. Step 1: Write the proportion equation
   12,989.69 : 19,479.74 = 4,667.47 : x
2. Step 2: Convert to fraction form
   12,989.69/19,479.74 = 4,667.47/x
3. Step 3: Cross multiply
   12,989.69x = 19,479.74 × 4,667.47
4. Step 4: Simplify right side
   12,989.69x = 90,921,102.06
5. Step 5: Solve for x
   x = 90,921,102.06/12,989.69
6. Step 6: Final answer
   x = 6,999.48