Finding the Fourth Proportional to 13,404.69, 20,085.17 and 12,892.77

Step by Step Solution

1. Step 1: Write the proportion equation
   13,404.69 : 20,085.17 = 12,892.77 : x
2. Step 2: Convert to fraction form
   13,404.69/20,085.17 = 12,892.77/x
3. Step 3: Cross multiply
   13,404.69x = 20,085.17 × 12,892.77
4. Step 4: Simplify right side
   13,404.69x = 258,953,412.76
5. Step 5: Solve for x
   x = 258,953,412.76/13,404.69
6. Step 6: Final answer
   x = 19,318.12