Finding the Fourth Proportional to 23,100.47, 31,878.61 and 12,490.07

Step by Step Solution

1. Step 1: Write the proportion equation
   23,100.47 : 31,878.61 = 12,490.07 : x
2. Step 2: Convert to fraction form
   23,100.47/31,878.61 = 12,490.07/x
3. Step 3: Cross multiply
   23,100.47x = 31,878.61 × 12,490.07
4. Step 4: Simplify right side
   23,100.47x = 398,166,070.40
5. Step 5: Solve for x
   x = 398,166,070.40/23,100.47
6. Step 6: Final answer
   x = 17,236.28