Finding the Fourth Proportional to 1,419.72, 2,130.72 and 980.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.72 : 2,130.72 = 980.70 : x
2. Step 2: Convert to fraction form
   1,419.72/2,130.72 = 980.70/x
3. Step 3: Cross multiply
   1,419.72x = 2,130.72 × 980.70
4. Step 4: Simplify right side
   1,419.72x = 2,089,597.10
5. Step 5: Solve for x
   x = 2,089,597.10/1,419.72
6. Step 6: Final answer
   x = 1,471.84