Finding the Fourth Proportional to 10,421.41, 14,388.27 and 9,300.43

Step by Step Solution

1. Step 1: Write the proportion equation
   10,421.41 : 14,388.27 = 9,300.43 : x
2. Step 2: Convert to fraction form
   10,421.41/14,388.27 = 9,300.43/x
3. Step 3: Cross multiply
   10,421.41x = 14,388.27 × 9,300.43
4. Step 4: Simplify right side
   10,421.41x = 133,817,097.96
5. Step 5: Solve for x
   x = 133,817,097.96/10,421.41
6. Step 6: Final answer
   x = 12,840.59