Finding the Fourth Proportional to 1,061.37, 1,591.65 and 436.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.37 : 1,591.65 = 436.59 : x
2. Step 2: Convert to fraction form
   1,061.37/1,591.65 = 436.59/x
3. Step 3: Cross multiply
   1,061.37x = 1,591.65 × 436.59
4. Step 4: Simplify right side
   1,061.37x = 694,898.47
5. Step 5: Solve for x
   x = 694,898.47/1,061.37
6. Step 6: Final answer
   x = 654.72