Finding the Fourth Proportional to 1,228.04, 1,838.20 and 788.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,228.04 : 1,838.20 = 788.72 : x
2. Step 2: Convert to fraction form
   1,228.04/1,838.20 = 788.72/x
3. Step 3: Cross multiply
   1,228.04x = 1,838.20 × 788.72
4. Step 4: Simplify right side
   1,228.04x = 1,449,825.10
5. Step 5: Solve for x
   x = 1,449,825.10/1,228.04
6. Step 6: Final answer
   x = 1,180.60