Finding the Fourth Proportional to 5,151.34, 7,660.73 and 4,987.31

Step by Step Solution

1. Step 1: Write the proportion equation
   5,151.34 : 7,660.73 = 4,987.31 : x
2. Step 2: Convert to fraction form
   5,151.34/7,660.73 = 4,987.31/x
3. Step 3: Cross multiply
   5,151.34x = 7,660.73 × 4,987.31
4. Step 4: Simplify right side
   5,151.34x = 38,206,435.34
5. Step 5: Solve for x
   x = 38,206,435.34/5,151.34
6. Step 6: Final answer
   x = 7,416.80