Finding the Fourth Proportional to 21,400.54, 32,038.35 and 12,488.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,400.54 : 32,038.35 = 12,488.56 : x
2. Step 2: Convert to fraction form
   21,400.54/32,038.35 = 12,488.56/x
3. Step 3: Cross multiply
   21,400.54x = 32,038.35 × 12,488.56
4. Step 4: Simplify right side
   21,400.54x = 400,112,856.28
5. Step 5: Solve for x
   x = 400,112,856.28/21,400.54
6. Step 6: Final answer
   x = 18,696.39