Finding the Fourth Proportional to 13,872.81, 20,799.50 and 5,106.59

Step by Step Solution

1. Step 1: Write the proportion equation
   13,872.81 : 20,799.50 = 5,106.59 : x
2. Step 2: Convert to fraction form
   13,872.81/20,799.50 = 5,106.59/x
3. Step 3: Cross multiply
   13,872.81x = 20,799.50 × 5,106.59
4. Step 4: Simplify right side
   13,872.81x = 106,214,389.17
5. Step 5: Solve for x
   x = 106,214,389.17/13,872.81
6. Step 6: Final answer
   x = 7,656.30