Finding the Fourth Proportional to 10,421, 14,380.98 and 7,770.68

Step by Step Solution

1. Step 1: Write the proportion equation
   10,421 : 14,380.98 = 7,770.68 : x
2. Step 2: Convert to fraction form
   10,421/14,380.98 = 7,770.68/x
3. Step 3: Cross multiply
   10,421x = 14,380.98 × 7,770.68
4. Step 4: Simplify right side
   10,421x = 111,749,993.67
5. Step 5: Solve for x
   x = 111,749,993.67/10,421
6. Step 6: Final answer
   x = 10,723.54