Finding the Fourth Proportional to 3,711.98, 5,124.38 and 2,870.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,711.98 : 5,124.38 = 2,870.78 : x
2. Step 2: Convert to fraction form
   3,711.98/5,124.38 = 2,870.78/x
3. Step 3: Cross multiply
   3,711.98x = 5,124.38 × 2,870.78
4. Step 4: Simplify right side
   3,711.98x = 14,710,967.62
5. Step 5: Solve for x
   x = 14,710,967.62/3,711.98
6. Step 6: Final answer
   x = 3,963.11