Finding the Fourth Proportional to 19,039.89, 28,570.17 and 7,947.55

Step by Step Solution

1. Step 1: Write the proportion equation
   19,039.89 : 28,570.17 = 7,947.55 : x
2. Step 2: Convert to fraction form
   19,039.89/28,570.17 = 7,947.55/x
3. Step 3: Cross multiply
   19,039.89x = 28,570.17 × 7,947.55
4. Step 4: Simplify right side
   19,039.89x = 227,062,783.16
5. Step 5: Solve for x
   x = 227,062,783.16/19,039.89
6. Step 6: Final answer
   x = 11,925.64