Finding the Fourth Proportional to 3,985.59, 5,500.74 and 2,870.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,985.59 : 5,500.74 = 2,870.22 : x
2. Step 2: Convert to fraction form
   3,985.59/5,500.74 = 2,870.22/x
3. Step 3: Cross multiply
   3,985.59x = 5,500.74 × 2,870.22
4. Step 4: Simplify right side
   3,985.59x = 15,788,333.96
5. Step 5: Solve for x
   x = 15,788,333.96/3,985.59
6. Step 6: Final answer
   x = 3,961.35