Finding the Fourth Proportional to 12,976.42, 17,886.42 and 10,138.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,976.42 : 17,886.42 = 10,138.84 : x
2. Step 2: Convert to fraction form
   12,976.42/17,886.42 = 10,138.84/x
3. Step 3: Cross multiply
   12,976.42x = 17,886.42 × 10,138.84
4. Step 4: Simplify right side
   12,976.42x = 181,347,550.55
5. Step 5: Solve for x
   x = 181,347,550.55/12,976.42
6. Step 6: Final answer
   x = 13,975.17