Finding the Fourth Proportional to 1,398.52, 1,929.94 and 777.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.52 : 1,929.94 = 777.52 : x
2. Step 2: Convert to fraction form
   1,398.52/1,929.94 = 777.52/x
3. Step 3: Cross multiply
   1,398.52x = 1,929.94 × 777.52
4. Step 4: Simplify right side
   1,398.52x = 1,500,566.95
5. Step 5: Solve for x
   x = 1,500,566.95/1,398.52
6. Step 6: Final answer
   x = 1,072.97