Finding the Fourth Proportional to 12,640.19, 18,951.17 and 3,870.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,640.19 : 18,951.17 = 3,870.32 : x
2. Step 2: Convert to fraction form
   12,640.19/18,951.17 = 3,870.32/x
3. Step 3: Cross multiply
   12,640.19x = 18,951.17 × 3,870.32
4. Step 4: Simplify right side
   12,640.19x = 73,346,978.17
5. Step 5: Solve for x
   x = 73,346,978.17/12,640.19
6. Step 6: Final answer
   x = 5,802.68