Finding the Fourth Proportional to 1,591.68, 2,385.86 and 667.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.68 : 2,385.86 = 667.76 : x
2. Step 2: Convert to fraction form
   1,591.68/2,385.86 = 667.76/x
3. Step 3: Cross multiply
   1,591.68x = 2,385.86 × 667.76
4. Step 4: Simplify right side
   1,591.68x = 1,593,181.87
5. Step 5: Solve for x
   x = 1,593,181.87/1,591.68
6. Step 6: Final answer
   x = 1,000.94