Finding the Fourth Proportional to 1,660.18, 2,488.89 and 782.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,660.18 : 2,488.89 = 782.25 : x
2. Step 2: Convert to fraction form
   1,660.18/2,488.89 = 782.25/x
3. Step 3: Cross multiply
   1,660.18x = 2,488.89 × 782.25
4. Step 4: Simplify right side
   1,660.18x = 1,946,921.76
5. Step 5: Solve for x
   x = 1,946,921.76/1,660.18
6. Step 6: Final answer
   x = 1,172.72