Finding the Fourth Proportional to 6,667.87, 10,002.31 and 1,987.79

Step by Step Solution

1. Step 1: Write the proportion equation
   6,667.87 : 10,002.31 = 1,987.79 : x
2. Step 2: Convert to fraction form
   6,667.87/10,002.31 = 1,987.79/x
3. Step 3: Cross multiply
   6,667.87x = 10,002.31 × 1,987.79
4. Step 4: Simplify right side
   6,667.87x = 19,882,491.79
5. Step 5: Solve for x
   x = 19,882,491.79/6,667.87
6. Step 6: Final answer
   x = 2,981.84