Finding the Fourth Proportional to 7,120.71, 9,823.58 and 4,288.07

Step by Step Solution

1. Step 1: Write the proportion equation
   7,120.71 : 9,823.58 = 4,288.07 : x
2. Step 2: Convert to fraction form
   7,120.71/9,823.58 = 4,288.07/x
3. Step 3: Cross multiply
   7,120.71x = 9,823.58 × 4,288.07
4. Step 4: Simplify right side
   7,120.71x = 42,124,217.89
5. Step 5: Solve for x
   x = 42,124,217.89/7,120.71
6. Step 6: Final answer
   x = 5,915.73