Finding the Fourth Proportional to 12,770.72, 17,618.74 and 9,421.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,770.72 : 17,618.74 = 9,421.50 : x
2. Step 2: Convert to fraction form
   12,770.72/17,618.74 = 9,421.50/x
3. Step 3: Cross multiply
   12,770.72x = 17,618.74 × 9,421.50
4. Step 4: Simplify right side
   12,770.72x = 165,994,935.36
5. Step 5: Solve for x
   x = 165,994,935.36/12,770.72
6. Step 6: Final answer
   x = 12,998.09