Finding the Fourth Proportional to 4,752.10, 7,128.60 and 1,978.71

Step by Step Solution

1. Step 1: Write the proportion equation
   4,752.10 : 7,128.60 = 1,978.71 : x
2. Step 2: Convert to fraction form
   4,752.10/7,128.60 = 1,978.71/x
3. Step 3: Cross multiply
   4,752.10x = 7,128.60 × 1,978.71
4. Step 4: Simplify right side
   4,752.10x = 14,105,396.46
5. Step 5: Solve for x
   x = 14,105,396.46/4,752.10
6. Step 6: Final answer
   x = 2,968.24