Finding the Fourth Proportional to 1,591.63, 2,385.72 and 667.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.63 : 2,385.72 = 667.69 : x
2. Step 2: Convert to fraction form
   1,591.63/2,385.72 = 667.69/x
3. Step 3: Cross multiply
   1,591.63x = 2,385.72 × 667.69
4. Step 4: Simplify right side
   1,591.63x = 1,592,915.42
5. Step 5: Solve for x
   x = 1,592,915.42/1,591.63
6. Step 6: Final answer
   x = 1,000.81