Finding the Fourth Proportional to 13,870.71, 20,804.72 and 7,628.67

Step by Step Solution

1. Step 1: Write the proportion equation
   13,870.71 : 20,804.72 = 7,628.67 : x
2. Step 2: Convert to fraction form
   13,870.71/20,804.72 = 7,628.67/x
3. Step 3: Cross multiply
   13,870.71x = 20,804.72 × 7,628.67
4. Step 4: Simplify right side
   13,870.71x = 158,712,305.18
5. Step 5: Solve for x
   x = 158,712,305.18/13,870.71
6. Step 6: Final answer
   x = 11,442.26