Finding the Fourth Proportional to 10,421.35, 14,388.18 and 9,300.37

Step by Step Solution

1. Step 1: Write the proportion equation
   10,421.35 : 14,388.18 = 9,300.37 : x
2. Step 2: Convert to fraction form
   10,421.35/14,388.18 = 9,300.37/x
3. Step 3: Cross multiply
   10,421.35x = 14,388.18 × 9,300.37
4. Step 4: Simplify right side
   10,421.35x = 133,815,397.63
5. Step 5: Solve for x
   x = 133,815,397.63/10,421.35
6. Step 6: Final answer
   x = 12,840.51