Finding the Fourth Proportional to 1,396.53, 1,926.20 and 899.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.53 : 1,926.20 = 899.67 : x
2. Step 2: Convert to fraction form
   1,396.53/1,926.20 = 899.67/x
3. Step 3: Cross multiply
   1,396.53x = 1,926.20 × 899.67
4. Step 4: Simplify right side
   1,396.53x = 1,732,939.86
5. Step 5: Solve for x
   x = 1,732,939.86/1,396.53
6. Step 6: Final answer
   x = 1,240.89