Finding the Fourth Proportional to 10,667.42, 15,979.70 and 5,314.47

Step by Step Solution

1. Step 1: Write the proportion equation
   10,667.42 : 15,979.70 = 5,314.47 : x
2. Step 2: Convert to fraction form
   10,667.42/15,979.70 = 5,314.47/x
3. Step 3: Cross multiply
   10,667.42x = 15,979.70 × 5,314.47
4. Step 4: Simplify right side
   10,667.42x = 84,923,582.17
5. Step 5: Solve for x
   x = 84,923,582.17/10,667.42
6. Step 6: Final answer
   x = 7,961.02