Finding the Fourth Proportional to 21,570.14, 32,342.45 and 8,407.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,570.14 : 32,342.45 = 8,407.15 : x
2. Step 2: Convert to fraction form
   21,570.14/32,342.45 = 8,407.15/x
3. Step 3: Cross multiply
   21,570.14x = 32,342.45 × 8,407.15
4. Step 4: Simplify right side
   21,570.14x = 271,907,828.52
5. Step 5: Solve for x
   x = 271,907,828.52/21,570.14
6. Step 6: Final answer
   x = 12,605.75