Finding the Fourth Proportional to 13,456.39, 20,156.79 and 7,892.98

Step by Step Solution

1. Step 1: Write the proportion equation
   13,456.39 : 20,156.79 = 7,892.98 : x
2. Step 2: Convert to fraction form
   13,456.39/20,156.79 = 7,892.98/x
3. Step 3: Cross multiply
   13,456.39x = 20,156.79 × 7,892.98
4. Step 4: Simplify right side
   13,456.39x = 159,097,140.33
5. Step 5: Solve for x
   x = 159,097,140.33/13,456.39
6. Step 6: Final answer
   x = 11,823.17