Finding the Fourth Proportional to 1,419.39, 2,128.59 and 899.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.39 : 2,128.59 = 899.96 : x
2. Step 2: Convert to fraction form
   1,419.39/2,128.59 = 899.96/x
3. Step 3: Cross multiply
   1,419.39x = 2,128.59 × 899.96
4. Step 4: Simplify right side
   1,419.39x = 1,915,635.21
5. Step 5: Solve for x
   x = 1,915,635.21/1,419.39
6. Step 6: Final answer
   x = 1,349.62