Finding the Fourth Proportional to 12,591.75, 18,870.60 and 4,796.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,591.75 : 18,870.60 = 4,796.31 : x
2. Step 2: Convert to fraction form
   12,591.75/18,870.60 = 4,796.31/x
3. Step 3: Cross multiply
   12,591.75x = 18,870.60 × 4,796.31
4. Step 4: Simplify right side
   12,591.75x = 90,509,247.49
5. Step 5: Solve for x
   x = 90,509,247.49/12,591.75
6. Step 6: Final answer
   x = 7,187.98