Finding the Fourth Proportional to 1,410.72, 2,115.42 and 436.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,410.72 : 2,115.42 = 436.59 : x
2. Step 2: Convert to fraction form
   1,410.72/2,115.42 = 436.59/x
3. Step 3: Cross multiply
   1,410.72x = 2,115.42 × 436.59
4. Step 4: Simplify right side
   1,410.72x = 923,569.58
5. Step 5: Solve for x
   x = 923,569.58/1,410.72
6. Step 6: Final answer
   x = 654.68