Finding the Fourth Proportional to 1,396.20, 1,927.32 and 899.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.20 : 1,927.32 = 899.47 : x
2. Step 2: Convert to fraction form
   1,396.20/1,927.32 = 899.47/x
3. Step 3: Cross multiply
   1,396.20x = 1,927.32 × 899.47
4. Step 4: Simplify right side
   1,396.20x = 1,733,566.52
5. Step 5: Solve for x
   x = 1,733,566.52/1,396.20
6. Step 6: Final answer
   x = 1,241.63