Finding the Fourth Proportional to 10,376.10, 14,284.35 and 8,978.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,376.10 : 14,284.35 = 8,978.31 : x
2. Step 2: Convert to fraction form
   10,376.10/14,284.35 = 8,978.31/x
3. Step 3: Cross multiply
   10,376.10x = 14,284.35 × 8,978.31
4. Step 4: Simplify right side
   10,376.10x = 128,249,322.45
5. Step 5: Solve for x
   x = 128,249,322.45/10,376.10
6. Step 6: Final answer
   x = 12,360.07