Finding the Fourth Proportional to 2,069.78, 3,101.52 and 1,247.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,069.78 : 3,101.52 = 1,247.12 : x
2. Step 2: Convert to fraction form
   2,069.78/3,101.52 = 1,247.12/x
3. Step 3: Cross multiply
   2,069.78x = 3,101.52 × 1,247.12
4. Step 4: Simplify right side
   2,069.78x = 3,867,967.62
5. Step 5: Solve for x
   x = 3,867,967.62/2,069.78
6. Step 6: Final answer
   x = 1,868.78