Finding the Fourth Proportional to 10,387.78, 14,335.09 and 5,672.07

Step by Step Solution

1. Step 1: Write the proportion equation
   10,387.78 : 14,335.09 = 5,672.07 : x
2. Step 2: Convert to fraction form
   10,387.78/14,335.09 = 5,672.07/x
3. Step 3: Cross multiply
   10,387.78x = 14,335.09 × 5,672.07
4. Step 4: Simplify right side
   10,387.78x = 81,309,633.94
5. Step 5: Solve for x
   x = 81,309,633.94/10,387.78
6. Step 6: Final answer
   x = 7,827.43