Finding the Fourth Proportional to 6,411.61, 9,621.20 and 4,071.52

Step by Step Solution

1. Step 1: Write the proportion equation
   6,411.61 : 9,621.20 = 4,071.52 : x
2. Step 2: Convert to fraction form
   6,411.61/9,621.20 = 4,071.52/x
3. Step 3: Cross multiply
   6,411.61x = 9,621.20 × 4,071.52
4. Step 4: Simplify right side
   6,411.61x = 39,172,908.22
5. Step 5: Solve for x
   x = 39,172,908.22/6,411.61
6. Step 6: Final answer
   x = 6,109.68