Finding the Fourth Proportional to 13,788.56, 19,030.18 and 7,821.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,788.56 : 19,030.18 = 7,821.72 : x
2. Step 2: Convert to fraction form
   13,788.56/19,030.18 = 7,821.72/x
3. Step 3: Cross multiply
   13,788.56x = 19,030.18 × 7,821.72
4. Step 4: Simplify right side
   13,788.56x = 148,848,739.51
5. Step 5: Solve for x
   x = 148,848,739.51/13,788.56
6. Step 6: Final answer
   x = 10,795.09