Finding the Fourth Proportional to 2,972.50, 4,099.62 and 1,978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,972.50 : 4,099.62 = 1,978.18 : x
2. Step 2: Convert to fraction form
   2,972.50/4,099.62 = 1,978.18/x
3. Step 3: Cross multiply
   2,972.50x = 4,099.62 × 1,978.18
4. Step 4: Simplify right side
   2,972.50x = 8,109,786.29
5. Step 5: Solve for x
   x = 8,109,786.29/2,972.50
6. Step 6: Final answer
   x = 2,728.27