Finding the Fourth Proportional to 17,722.31, 24,423.15 and 12,677.78

Step by Step Solution

1. Step 1: Write the proportion equation
   17,722.31 : 24,423.15 = 12,677.78 : x
2. Step 2: Convert to fraction form
   17,722.31/24,423.15 = 12,677.78/x
3. Step 3: Cross multiply
   17,722.31x = 24,423.15 × 12,677.78
4. Step 4: Simplify right side
   17,722.31x = 309,631,222.51
5. Step 5: Solve for x
   x = 309,631,222.51/17,722.31
6. Step 6: Final answer
   x = 17,471.27