Finding the Fourth Proportional to 13,377.86, 18,462.78 and 7,788.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,377.86 : 18,462.78 = 7,788.50 : x
2. Step 2: Convert to fraction form
   13,377.86/18,462.78 = 7,788.50/x
3. Step 3: Cross multiply
   13,377.86x = 18,462.78 × 7,788.50
4. Step 4: Simplify right side
   13,377.86x = 143,797,362.03
5. Step 5: Solve for x
   x = 143,797,362.03/13,377.86
6. Step 6: Final answer
   x = 10,748.91