Finding the Fourth Proportional to 1,785.31, 2,463.72 and 988.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,785.31 : 2,463.72 = 988.65 : x
2. Step 2: Convert to fraction form
   1,785.31/2,463.72 = 988.65/x
3. Step 3: Cross multiply
   1,785.31x = 2,463.72 × 988.65
4. Step 4: Simplify right side
   1,785.31x = 2,435,756.78
5. Step 5: Solve for x
   x = 2,435,756.78/1,785.31
6. Step 6: Final answer
   x = 1,364.33