Finding the Fourth Proportional to 5,116.80, 7,061.34 and 2,878.62

Step by Step Solution

1. Step 1: Write the proportion equation
   5,116.80 : 7,061.34 = 2,878.62 : x
2. Step 2: Convert to fraction form
   5,116.80/7,061.34 = 2,878.62/x
3. Step 3: Cross multiply
   5,116.80x = 7,061.34 × 2,878.62
4. Step 4: Simplify right side
   5,116.80x = 20,326,914.55
5. Step 5: Solve for x
   x = 20,326,914.55/5,116.80
6. Step 6: Final answer
   x = 3,972.58