Finding the Fourth Proportional to 1,066.39, 1,591.63 and 909.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.39 : 1,591.63 = 909.18 : x
2. Step 2: Convert to fraction form
   1,066.39/1,591.63 = 909.18/x
3. Step 3: Cross multiply
   1,066.39x = 1,591.63 × 909.18
4. Step 4: Simplify right side
   1,066.39x = 1,447,075.89
5. Step 5: Solve for x
   x = 1,447,075.89/1,066.39
6. Step 6: Final answer
   x = 1,356.99