Finding the Fourth Proportional to 5,116.56, 7,061.60 and 2,878.60

Step by Step Solution

1. Step 1: Write the proportion equation
   5,116.56 : 7,061.60 = 2,878.60 : x
2. Step 2: Convert to fraction form
   5,116.56/7,061.60 = 2,878.60/x
3. Step 3: Cross multiply
   5,116.56x = 7,061.60 × 2,878.60
4. Step 4: Simplify right side
   5,116.56x = 20,327,521.76
5. Step 5: Solve for x
   x = 20,327,521.76/5,116.56
6. Step 6: Final answer
   x = 3,972.89