Finding the Fourth Proportional to 1,562.83, 2,156.78 and 899.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,562.83 : 2,156.78 = 899.78 : x
2. Step 2: Convert to fraction form
   1,562.83/2,156.78 = 899.78/x
3. Step 3: Cross multiply
   1,562.83x = 2,156.78 × 899.78
4. Step 4: Simplify right side
   1,562.83x = 1,940,616.72
5. Step 5: Solve for x
   x = 1,940,616.72/1,562.83
6. Step 6: Final answer
   x = 1,241.74