Finding the Fourth Proportional to 1,398.52, 1,929.98 and 777.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.52 : 1,929.98 = 777.56 : x
2. Step 2: Convert to fraction form
   1,398.52/1,929.98 = 777.56/x
3. Step 3: Cross multiply
   1,398.52x = 1,929.98 × 777.56
4. Step 4: Simplify right side
   1,398.52x = 1,500,675.25
5. Step 5: Solve for x
   x = 1,500,675.25/1,398.52
6. Step 6: Final answer
   x = 1,073.05