Finding the Fourth Proportional to 1,563.86, 2,158.67 and 900.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.86 : 2,158.67 = 900.98 : x
2. Step 2: Convert to fraction form
   1,563.86/2,158.67 = 900.98/x
3. Step 3: Cross multiply
   1,563.86x = 2,158.67 × 900.98
4. Step 4: Simplify right side
   1,563.86x = 1,944,918.50
5. Step 5: Solve for x
   x = 1,944,918.50/1,563.86
6. Step 6: Final answer
   x = 1,243.67