Finding the Fourth Proportional to 22,928, 31,641.12 and 12,992

Step by Step Solution

1. Step 1: Write the proportion equation
   22,928 : 31,641.12 = 12,992 : x
2. Step 2: Convert to fraction form
   22,928/31,641.12 = 12,992/x
3. Step 3: Cross multiply
   22,928x = 31,641.12 × 12,992
4. Step 4: Simplify right side
   22,928x = 411,081,431.04
5. Step 5: Solve for x
   x = 411,081,431.04/22,928
6. Step 6: Final answer
   x = 17,929.23