Finding the Fourth Proportional to 22,776.72, 31,431.90 and 12,705.80

Step by Step Solution

1. Step 1: Write the proportion equation
   22,776.72 : 31,431.90 = 12,705.80 : x
2. Step 2: Convert to fraction form
   22,776.72/31,431.90 = 12,705.80/x
3. Step 3: Cross multiply
   22,776.72x = 31,431.90 × 12,705.80
4. Step 4: Simplify right side
   22,776.72x = 399,367,435.02
5. Step 5: Solve for x
   x = 399,367,435.02/22,776.72
6. Step 6: Final answer
   x = 17,534.02