Finding the Fourth Proportional to 1,419.08, 1,956.72 and 999.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.08 : 1,956.72 = 999.30 : x
2. Step 2: Convert to fraction form
   1,419.08/1,956.72 = 999.30/x
3. Step 3: Cross multiply
   1,419.08x = 1,956.72 × 999.30
4. Step 4: Simplify right side
   1,419.08x = 1,955,345.30
5. Step 5: Solve for x
   x = 1,955,345.30/1,419.08
6. Step 6: Final answer
   x = 1,377.90