Finding the Fourth Proportional to 1,180.56, 1,771.98 and 900.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,180.56 : 1,771.98 = 900.30 : x
2. Step 2: Convert to fraction form
   1,180.56/1,771.98 = 900.30/x
3. Step 3: Cross multiply
   1,180.56x = 1,771.98 × 900.30
4. Step 4: Simplify right side
   1,180.56x = 1,595,313.59
5. Step 5: Solve for x
   x = 1,595,313.59/1,180.56
6. Step 6: Final answer
   x = 1,351.32