Finding the Fourth Proportional to 1,665.92, 2,499.96 and 692.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.92 : 2,499.96 = 692.72 : x
2. Step 2: Convert to fraction form
   1,665.92/2,499.96 = 692.72/x
3. Step 3: Cross multiply
   1,665.92x = 2,499.96 × 692.72
4. Step 4: Simplify right side
   1,665.92x = 1,731,772.29
5. Step 5: Solve for x
   x = 1,731,772.29/1,665.92
6. Step 6: Final answer
   x = 1,039.53