Finding the Fourth Proportional to 1,388.52, 1,916.18 and 767.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.52 : 1,916.18 = 767.48 : x
2. Step 2: Convert to fraction form
   1,388.52/1,916.18 = 767.48/x
3. Step 3: Cross multiply
   1,388.52x = 1,916.18 × 767.48
4. Step 4: Simplify right side
   1,388.52x = 1,470,629.83
5. Step 5: Solve for x
   x = 1,470,629.83/1,388.52
6. Step 6: Final answer
   x = 1,059.13