Finding the Fourth Proportional to 10,393.90, 14,343.37 and 5,678.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,393.90 : 14,343.37 = 5,678.21 : x
2. Step 2: Convert to fraction form
   10,393.90/14,343.37 = 5,678.21/x
3. Step 3: Cross multiply
   10,393.90x = 14,343.37 × 5,678.21
4. Step 4: Simplify right side
   10,393.90x = 81,444,688.63
5. Step 5: Solve for x
   x = 81,444,688.63/10,393.90
6. Step 6: Final answer
   x = 7,835.82