Finding the Fourth Proportional to 1,665.96, 2,499.18 and 570.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.96 : 2,499.18 = 570.48 : x
2. Step 2: Convert to fraction form
   1,665.96/2,499.18 = 570.48/x
3. Step 3: Cross multiply
   1,665.96x = 2,499.18 × 570.48
4. Step 4: Simplify right side
   1,665.96x = 1,425,732.21
5. Step 5: Solve for x
   x = 1,425,732.21/1,665.96
6. Step 6: Final answer
   x = 855.80