Finding the Fourth Proportional to 1,396.17, 1,926.75 and 899.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.17 : 1,926.75 = 899.78 : x
2. Step 2: Convert to fraction form
   1,396.17/1,926.75 = 899.78/x
3. Step 3: Cross multiply
   1,396.17x = 1,926.75 × 899.78
4. Step 4: Simplify right side
   1,396.17x = 1,733,644.86
5. Step 5: Solve for x
   x = 1,733,644.86/1,396.17
6. Step 6: Final answer
   x = 1,241.71