Finding the Fourth Proportional to 34,187.32, 51,268.83 and 13,128.94

Step by Step Solution

1. Step 1: Write the proportion equation
   34,187.32 : 51,268.83 = 13,128.94 : x
2. Step 2: Convert to fraction form
   34,187.32/51,268.83 = 13,128.94/x
3. Step 3: Cross multiply
   34,187.32x = 51,268.83 × 13,128.94
4. Step 4: Simplify right side
   34,187.32x = 673,105,392.94
5. Step 5: Solve for x
   x = 673,105,392.94/34,187.32
6. Step 6: Final answer
   x = 19,688.74