Finding the Fourth Proportional to 1,562.98, 2,156.89 and 899.85

Step by Step Solution

1. Step 1: Write the proportion equation
   1,562.98 : 2,156.89 = 899.85 : x
2. Step 2: Convert to fraction form
   1,562.98/2,156.89 = 899.85/x
3. Step 3: Cross multiply
   1,562.98x = 2,156.89 × 899.85
4. Step 4: Simplify right side
   1,562.98x = 1,940,877.47
5. Step 5: Solve for x
   x = 1,940,877.47/1,562.98
6. Step 6: Final answer
   x = 1,241.78