Finding the Fourth Proportional to 10,421.78, 14,382.06 and 5,706.36

Step by Step Solution

1. Step 1: Write the proportion equation
   10,421.78 : 14,382.06 = 5,706.36 : x
2. Step 2: Convert to fraction form
   10,421.78/14,382.06 = 5,706.36/x
3. Step 3: Cross multiply
   10,421.78x = 14,382.06 × 5,706.36
4. Step 4: Simplify right side
   10,421.78x = 82,069,211.90
5. Step 5: Solve for x
   x = 82,069,211.90/10,421.78
6. Step 6: Final answer
   x = 7,874.78