Finding the Fourth Proportional to 21,357.78, 32,002.06 and 13,012.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,357.78 : 32,002.06 = 13,012.48 : x
2. Step 2: Convert to fraction form
   21,357.78/32,002.06 = 13,012.48/x
3. Step 3: Cross multiply
   21,357.78x = 32,002.06 × 13,012.48
4. Step 4: Simplify right side
   21,357.78x = 416,426,165.71
5. Step 5: Solve for x
   x = 416,426,165.71/21,357.78
6. Step 6: Final answer
   x = 19,497.63