Finding the Fourth Proportional to 3,915.19, 5,842.42 and 3,499.75

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.19 : 5,842.42 = 3,499.75 : x
2. Step 2: Convert to fraction form
   3,915.19/5,842.42 = 3,499.75/x
3. Step 3: Cross multiply
   3,915.19x = 5,842.42 × 3,499.75
4. Step 4: Simplify right side
   3,915.19x = 20,447,009.40
5. Step 5: Solve for x
   x = 20,447,009.40/3,915.19
6. Step 6: Final answer
   x = 5,222.48