Finding the Fourth Proportional to 1,599.34, 2,207.15 and 900.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,599.34 : 2,207.15 = 900.72 : x
2. Step 2: Convert to fraction form
   1,599.34/2,207.15 = 900.72/x
3. Step 3: Cross multiply
   1,599.34x = 2,207.15 × 900.72
4. Step 4: Simplify right side
   1,599.34x = 1,988,024.15
5. Step 5: Solve for x
   x = 1,988,024.15/1,599.34
6. Step 6: Final answer
   x = 1,243.03