Finding the Fourth Proportional to 2,007.85, 2,770.72 and 1,261.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,007.85 : 2,770.72 = 1,261.57 : x
2. Step 2: Convert to fraction form
   2,007.85/2,770.72 = 1,261.57/x
3. Step 3: Cross multiply
   2,007.85x = 2,770.72 × 1,261.57
4. Step 4: Simplify right side
   2,007.85x = 3,495,457.23
5. Step 5: Solve for x
   x = 3,495,457.23/2,007.85
6. Step 6: Final answer
   x = 1,740.90