Finding the Fourth Proportional to 1,562.78, 2,156.59 and 854.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,562.78 : 2,156.59 = 854.62 : x
2. Step 2: Convert to fraction form
   1,562.78/2,156.59 = 854.62/x
3. Step 3: Cross multiply
   1,562.78x = 2,156.59 × 854.62
4. Step 4: Simplify right side
   1,562.78x = 1,843,064.95
5. Step 5: Solve for x
   x = 1,843,064.95/1,562.78
6. Step 6: Final answer
   x = 1,179.35