Finding the Fourth Proportional to 1,396.16, 1,926.84 and 899.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.16 : 1,926.84 = 899.12 : x
2. Step 2: Convert to fraction form
   1,396.16/1,926.84 = 899.12/x
3. Step 3: Cross multiply
   1,396.16x = 1,926.84 × 899.12
4. Step 4: Simplify right side
   1,396.16x = 1,732,460.38
5. Step 5: Solve for x
   x = 1,732,460.38/1,396.16
6. Step 6: Final answer
   x = 1,240.88