Finding the Fourth Proportional to 2,807.78, 4,209.35 and 1,165.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,807.78 : 4,209.35 = 1,165.50 : x
2. Step 2: Convert to fraction form
   2,807.78/4,209.35 = 1,165.50/x
3. Step 3: Cross multiply
   2,807.78x = 4,209.35 × 1,165.50
4. Step 4: Simplify right side
   2,807.78x = 4,905,991.60
5. Step 5: Solve for x
   x = 4,905,991.60/2,807.78
6. Step 6: Final answer
   x = 1,747.29