Finding the Fourth Proportional to 1,053.86, 1,579.42 and 436.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,053.86 : 1,579.42 = 436.86 : x
2. Step 2: Convert to fraction form
   1,053.86/1,579.42 = 436.86/x
3. Step 3: Cross multiply
   1,053.86x = 1,579.42 × 436.86
4. Step 4: Simplify right side
   1,053.86x = 689,985.42
5. Step 5: Solve for x
   x = 689,985.42/1,053.86
6. Step 6: Final answer
   x = 654.72