Finding the Fourth Proportional to 14,499.64, 21,748.78 and 5,139.51

Step by Step Solution

1. Step 1: Write the proportion equation
   14,499.64 : 21,748.78 = 5,139.51 : x
2. Step 2: Convert to fraction form
   14,499.64/21,748.78 = 5,139.51/x
3. Step 3: Cross multiply
   14,499.64x = 21,748.78 × 5,139.51
4. Step 4: Simplify right side
   14,499.64x = 111,778,072.30
5. Step 5: Solve for x
   x = 111,778,072.30/14,499.64
6. Step 6: Final answer
   x = 7,709.02