Finding the Fourth Proportional to 8,870.85, 12,238.73 and 5,686.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,870.85 : 12,238.73 = 5,686.72 : x
2. Step 2: Convert to fraction form
   8,870.85/12,238.73 = 5,686.72/x
3. Step 3: Cross multiply
   8,870.85x = 12,238.73 × 5,686.72
4. Step 4: Simplify right side
   8,870.85x = 69,598,192.96
5. Step 5: Solve for x
   x = 69,598,192.96/8,870.85
6. Step 6: Final answer
   x = 7,845.72