Finding the Fourth Proportional to 1,419.30, 2,124.72 and 1,055.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.30 : 2,124.72 = 1,055.70 : x
2. Step 2: Convert to fraction form
   1,419.30/2,124.72 = 1,055.70/x
3. Step 3: Cross multiply
   1,419.30x = 2,124.72 × 1,055.70
4. Step 4: Simplify right side
   1,419.30x = 2,243,066.90
5. Step 5: Solve for x
   x = 2,243,066.90/1,419.30
6. Step 6: Final answer
   x = 1,580.40