Finding the Fourth Proportional to 1,061.35, 1,591.50 and 436.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.35 : 1,591.50 = 436.53 : x
2. Step 2: Convert to fraction form
   1,061.35/1,591.50 = 436.53/x
3. Step 3: Cross multiply
   1,061.35x = 1,591.50 × 436.53
4. Step 4: Simplify right side
   1,061.35x = 694,742.57
5. Step 5: Solve for x
   x = 694,742.57/1,061.35
6. Step 6: Final answer
   x = 654.58