Finding the Fourth Proportional to 1,385.51, 1,912.68 and 826.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.51 : 1,912.68 = 826.16 : x
2. Step 2: Convert to fraction form
   1,385.51/1,912.68 = 826.16/x
3. Step 3: Cross multiply
   1,385.51x = 1,912.68 × 826.16
4. Step 4: Simplify right side
   1,385.51x = 1,580,170.15
5. Step 5: Solve for x
   x = 1,580,170.15/1,385.51
6. Step 6: Final answer
   x = 1,140.50