Finding the Fourth Proportional to 10,387.80, 14,335.46 and 5,672.39

Step by Step Solution

1. Step 1: Write the proportion equation
   10,387.80 : 14,335.46 = 5,672.39 : x
2. Step 2: Convert to fraction form
   10,387.80/14,335.46 = 5,672.39/x
3. Step 3: Cross multiply
   10,387.80x = 14,335.46 × 5,672.39
4. Step 4: Simplify right side
   10,387.80x = 81,316,219.91
5. Step 5: Solve for x
   x = 81,316,219.91/10,387.80
6. Step 6: Final answer
   x = 7,828.05