Finding the Fourth Proportional to 1,087.94, 1,631.60 and 307.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.94 : 1,631.60 = 307.89 : x
2. Step 2: Convert to fraction form
   1,087.94/1,631.60 = 307.89/x
3. Step 3: Cross multiply
   1,087.94x = 1,631.60 × 307.89
4. Step 4: Simplify right side
   1,087.94x = 502,353.32
5. Step 5: Solve for x
   x = 502,353.32/1,087.94
6. Step 6: Final answer
   x = 461.75