Finding the Fourth Proportional to 4,752.72, 7,131.72 and 1,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   4,752.72 : 7,131.72 = 1,978.88 : x
2. Step 2: Convert to fraction form
   4,752.72/7,131.72 = 1,978.88/x
3. Step 3: Cross multiply
   4,752.72x = 7,131.72 × 1,978.88
4. Step 4: Simplify right side
   4,752.72x = 14,112,818.07
5. Step 5: Solve for x
   x = 14,112,818.07/4,752.72
6. Step 6: Final answer
   x = 2,969.42