Finding the Fourth Proportional to 22,830.78, 31,502.46 and 12,756

Step by Step Solution

1. Step 1: Write the proportion equation
   22,830.78 : 31,502.46 = 12,756 : x
2. Step 2: Convert to fraction form
   22,830.78/31,502.46 = 12,756/x
3. Step 3: Cross multiply
   22,830.78x = 31,502.46 × 12,756
4. Step 4: Simplify right side
   22,830.78x = 401,845,379.76
5. Step 5: Solve for x
   x = 401,845,379.76/22,830.78
6. Step 6: Final answer
   x = 17,601.04