Finding the Fourth Proportional to 1,419.56, 2,128.89 and 432.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,419.56 : 2,128.89 = 432.06 : x
2. Step 2: Convert to fraction form
   1,419.56/2,128.89 = 432.06/x
3. Step 3: Cross multiply
   1,419.56x = 2,128.89 × 432.06
4. Step 4: Simplify right side
   1,419.56x = 919,808.21
5. Step 5: Solve for x
   x = 919,808.21/1,419.56
6. Step 6: Final answer
   x = 647.96