Finding the Fourth Proportional to 19,554.89, 26,978.67 and 12,844.15

Step by Step Solution

1. Step 1: Write the proportion equation
   19,554.89 : 26,978.67 = 12,844.15 : x
2. Step 2: Convert to fraction form
   19,554.89/26,978.67 = 12,844.15/x
3. Step 3: Cross multiply
   19,554.89x = 26,978.67 × 12,844.15
4. Step 4: Simplify right side
   19,554.89x = 346,518,084.28
5. Step 5: Solve for x
   x = 346,518,084.28/19,554.89
6. Step 6: Final answer
   x = 17,720.28