Finding the Fourth Proportional to 1,385.59, 1,912.05 and 756.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.59 : 1,912.05 = 756.11 : x
2. Step 2: Convert to fraction form
   1,385.59/1,912.05 = 756.11/x
3. Step 3: Cross multiply
   1,385.59x = 1,912.05 × 756.11
4. Step 4: Simplify right side
   1,385.59x = 1,445,710.57
5. Step 5: Solve for x
   x = 1,445,710.57/1,385.59
6. Step 6: Final answer
   x = 1,043.39