Finding the Fourth Proportional to 1,419.19, 2,124.69 and 899.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.19 : 2,124.69 = 899.78 : x
2. Step 2: Convert to fraction form
   1,419.19/2,124.69 = 899.78/x
3. Step 3: Cross multiply
   1,419.19x = 2,124.69 × 899.78
4. Step 4: Simplify right side
   1,419.19x = 1,911,747.54
5. Step 5: Solve for x
   x = 1,911,747.54/1,419.19
6. Step 6: Final answer
   x = 1,347.07