Finding the Fourth Proportional to 19,875.34, 27,409.12 and 13,057.37

Step by Step Solution

1. Step 1: Write the proportion equation
   19,875.34 : 27,409.12 = 13,057.37 : x
2. Step 2: Convert to fraction form
   19,875.34/27,409.12 = 13,057.37/x
3. Step 3: Cross multiply
   19,875.34x = 27,409.12 × 13,057.37
4. Step 4: Simplify right side
   19,875.34x = 357,890,851.53
5. Step 5: Solve for x
   x = 357,890,851.53/19,875.34
6. Step 6: Final answer
   x = 18,006.78