Finding the Fourth Proportional to 5,153.67, 7,111.94 and 2,915.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,153.67 : 7,111.94 = 2,915.78 : x
2. Step 2: Convert to fraction form
   5,153.67/7,111.94 = 2,915.78/x
3. Step 3: Cross multiply
   5,153.67x = 7,111.94 × 2,915.78
4. Step 4: Simplify right side
   5,153.67x = 20,736,802.27
5. Step 5: Solve for x
   x = 20,736,802.27/5,153.67
6. Step 6: Final answer
   x = 4,023.70