Finding the Fourth Proportional to 19,978.50, 27,570.33 and 11,146.50

Step by Step Solution

1. Step 1: Write the proportion equation
   19,978.50 : 27,570.33 = 11,146.50 : x
2. Step 2: Convert to fraction form
   19,978.50/27,570.33 = 11,146.50/x
3. Step 3: Cross multiply
   19,978.50x = 27,570.33 × 11,146.50
4. Step 4: Simplify right side
   19,978.50x = 307,312,683.35
5. Step 5: Solve for x
   x = 307,312,683.35/19,978.50
6. Step 6: Final answer
   x = 15,382.17