Finding the Fourth Proportional to 8,870.58, 12,240.99 and 4,891.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,870.58 : 12,240.99 = 4,891.05 : x
2. Step 2: Convert to fraction form
   8,870.58/12,240.99 = 4,891.05/x
3. Step 3: Cross multiply
   8,870.58x = 12,240.99 × 4,891.05
4. Step 4: Simplify right side
   8,870.58x = 59,871,294.14
5. Step 5: Solve for x
   x = 59,871,294.14/8,870.58
6. Step 6: Final answer
   x = 6,749.42