Finding the Fourth Proportional to 1,385.30, 1,911.94 and 826.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.30 : 1,911.94 = 826.07 : x
2. Step 2: Convert to fraction form
   1,385.30/1,911.94 = 826.07/x
3. Step 3: Cross multiply
   1,385.30x = 1,911.94 × 826.07
4. Step 4: Simplify right side
   1,385.30x = 1,579,384.65
5. Step 5: Solve for x
   x = 1,579,384.65/1,385.30
6. Step 6: Final answer
   x = 1,140.10