Finding the Fourth Proportional to 3,816.84, 5,239.12 and 3,387.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,816.84 : 5,239.12 = 3,387.72 : x
2. Step 2: Convert to fraction form
   3,816.84/5,239.12 = 3,387.72/x
3. Step 3: Cross multiply
   3,816.84x = 5,239.12 × 3,387.72
4. Step 4: Simplify right side
   3,816.84x = 17,748,671.61
5. Step 5: Solve for x
   x = 17,748,671.61/3,816.84
6. Step 6: Final answer
   x = 4,650.10