Finding the Fourth Proportional to 3,915.64, 5,874.34 and 1,318.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.64 : 5,874.34 = 1,318.50 : x
2. Step 2: Convert to fraction form
   3,915.64/5,874.34 = 1,318.50/x
3. Step 3: Cross multiply
   3,915.64x = 5,874.34 × 1,318.50
4. Step 4: Simplify right side
   3,915.64x = 7,745,317.29
5. Step 5: Solve for x
   x = 7,745,317.29/3,915.64
6. Step 6: Final answer
   x = 1,978.05