Finding the Fourth Proportional to 19,012.39, 28,520.25 and 4,972.37

Step by Step Solution

1. Step 1: Write the proportion equation
   19,012.39 : 28,520.25 = 4,972.37 : x
2. Step 2: Convert to fraction form
   19,012.39/28,520.25 = 4,972.37/x
3. Step 3: Cross multiply
   19,012.39x = 28,520.25 × 4,972.37
4. Step 4: Simplify right side
   19,012.39x = 141,813,111.54
5. Step 5: Solve for x
   x = 141,813,111.54/19,012.39
6. Step 6: Final answer
   x = 7,458.98