Finding the Fourth Proportional to 1,685.67, 2,525.03 and 990.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,685.67 : 2,525.03 = 990.24 : x
2. Step 2: Convert to fraction form
   1,685.67/2,525.03 = 990.24/x
3. Step 3: Cross multiply
   1,685.67x = 2,525.03 × 990.24
4. Step 4: Simplify right side
   1,685.67x = 2,500,385.71
5. Step 5: Solve for x
   x = 2,500,385.71/1,685.67
6. Step 6: Final answer
   x = 1,483.32