Finding the Fourth Proportional to 12,858.72, 19,256.94 and 8,898.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,858.72 : 19,256.94 = 8,898.89 : x
2. Step 2: Convert to fraction form
   12,858.72/19,256.94 = 8,898.89/x
3. Step 3: Cross multiply
   12,858.72x = 19,256.94 × 8,898.89
4. Step 4: Simplify right side
   12,858.72x = 171,365,294.51
5. Step 5: Solve for x
   x = 171,365,294.51/12,858.72
6. Step 6: Final answer
   x = 13,326.78