Finding the Fourth Proportional to 13,858.86, 19,123.98 and 8,555.40

Step by Step Solution

1. Step 1: Write the proportion equation
   13,858.86 : 19,123.98 = 8,555.40 : x
2. Step 2: Convert to fraction form
   13,858.86/19,123.98 = 8,555.40/x
3. Step 3: Cross multiply
   13,858.86x = 19,123.98 × 8,555.40
4. Step 4: Simplify right side
   13,858.86x = 163,613,298.49
5. Step 5: Solve for x
   x = 163,613,298.49/13,858.86
6. Step 6: Final answer
   x = 11,805.68