Finding the Fourth Proportional to 21,401.22, 32,071.86 and 8,907.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,401.22 : 32,071.86 = 8,907.78 : x
2. Step 2: Convert to fraction form
   21,401.22/32,071.86 = 8,907.78/x
3. Step 3: Cross multiply
   21,401.22x = 32,071.86 × 8,907.78
4. Step 4: Simplify right side
   21,401.22x = 285,689,073.07
5. Step 5: Solve for x
   x = 285,689,073.07/21,401.22
6. Step 6: Final answer
   x = 13,349.20