Finding the Fourth Proportional to 1,392.65, 2,088.03 and 836.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.65 : 2,088.03 = 836.10 : x
2. Step 2: Convert to fraction form
   1,392.65/2,088.03 = 836.10/x
3. Step 3: Cross multiply
   1,392.65x = 2,088.03 × 836.10
4. Step 4: Simplify right side
   1,392.65x = 1,745,801.88
5. Step 5: Solve for x
   x = 1,745,801.88/1,392.65
6. Step 6: Final answer
   x = 1,253.59