Finding the Fourth Proportional to 1,860.31, 2,787.50 and 982.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,860.31 : 2,787.50 = 982.78 : x
2. Step 2: Convert to fraction form
   1,860.31/2,787.50 = 982.78/x
3. Step 3: Cross multiply
   1,860.31x = 2,787.50 × 982.78
4. Step 4: Simplify right side
   1,860.31x = 2,739,499.25
5. Step 5: Solve for x
   x = 2,739,499.25/1,860.31
6. Step 6: Final answer
   x = 1,472.60