Finding the Fourth Proportional to 1,089.61, 1,631.67 and 846.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.61 : 1,631.67 = 846.30 : x
2. Step 2: Convert to fraction form
   1,089.61/1,631.67 = 846.30/x
3. Step 3: Cross multiply
   1,089.61x = 1,631.67 × 846.30
4. Step 4: Simplify right side
   1,089.61x = 1,380,882.32
5. Step 5: Solve for x
   x = 1,380,882.32/1,089.61
6. Step 6: Final answer
   x = 1,267.32