Finding the Fourth Proportional to 12,751.42, 19,068.41 and 12,129.34

Step by Step Solution

1. Step 1: Write the proportion equation
   12,751.42 : 19,068.41 = 12,129.34 : x
2. Step 2: Convert to fraction form
   12,751.42/19,068.41 = 12,129.34/x
3. Step 3: Cross multiply
   12,751.42x = 19,068.41 × 12,129.34
4. Step 4: Simplify right side
   12,751.42x = 231,287,228.15
5. Step 5: Solve for x
   x = 231,287,228.15/12,751.42
6. Step 6: Final answer
   x = 18,138.15