Finding the Fourth Proportional to 23,100.48, 31,878.57 and 12,490.11

Step by Step Solution

1. Step 1: Write the proportion equation
   23,100.48 : 31,878.57 = 12,490.11 : x
2. Step 2: Convert to fraction form
   23,100.48/31,878.57 = 12,490.11/x
3. Step 3: Cross multiply
   23,100.48x = 31,878.57 × 12,490.11
4. Step 4: Simplify right side
   23,100.48x = 398,166,845.94
5. Step 5: Solve for x
   x = 398,166,845.94/23,100.48
6. Step 6: Final answer
   x = 17,236.30