Finding the Fourth Proportional to 12,789.37, 19,164.15 and 4,887.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,789.37 : 19,164.15 = 4,887.57 : x
2. Step 2: Convert to fraction form
   12,789.37/19,164.15 = 4,887.57/x
3. Step 3: Cross multiply
   12,789.37x = 19,164.15 × 4,887.57
4. Step 4: Simplify right side
   12,789.37x = 93,666,124.62
5. Step 5: Solve for x
   x = 93,666,124.62/12,789.37
6. Step 6: Final answer
   x = 7,323.75