Finding the Fourth Proportional to 8,870.63, 12,240.53 and 4,891.51

Step by Step Solution

1. Step 1: Write the proportion equation
   8,870.63 : 12,240.53 = 4,891.51 : x
2. Step 2: Convert to fraction form
   8,870.63/12,240.53 = 4,891.51/x
3. Step 3: Cross multiply
   8,870.63x = 12,240.53 × 4,891.51
4. Step 4: Simplify right side
   8,870.63x = 59,874,674.90
5. Step 5: Solve for x
   x = 59,874,674.90/8,870.63
6. Step 6: Final answer
   x = 6,749.77