Finding the Fourth Proportional to 1,396.34, 1,928.24 and 899.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.34 : 1,928.24 = 899.84 : x
2. Step 2: Convert to fraction form
   1,396.34/1,928.24 = 899.84/x
3. Step 3: Cross multiply
   1,396.34x = 1,928.24 × 899.84
4. Step 4: Simplify right side
   1,396.34x = 1,735,100.09
5. Step 5: Solve for x
   x = 1,735,100.09/1,396.34
6. Step 6: Final answer
   x = 1,242.61