Finding the Fourth Proportional to 1,591.92, 2,385.34 and 666.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.92 : 2,385.34 = 666.72 : x
2. Step 2: Convert to fraction form
   1,591.92/2,385.34 = 666.72/x
3. Step 3: Cross multiply
   1,591.92x = 2,385.34 × 666.72
4. Step 4: Simplify right side
   1,591.92x = 1,590,353.88
5. Step 5: Solve for x
   x = 1,590,353.88/1,591.92
6. Step 6: Final answer
   x = 999.02