Finding the Fourth Proportional to 1,385.58, 1,912.08 and 756.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.58 : 1,912.08 = 756.12 : x
2. Step 2: Convert to fraction form
   1,385.58/1,912.08 = 756.12/x
3. Step 3: Cross multiply
   1,385.58x = 1,912.08 × 756.12
4. Step 4: Simplify right side
   1,385.58x = 1,445,761.93
5. Step 5: Solve for x
   x = 1,445,761.93/1,385.58
6. Step 6: Final answer
   x = 1,043.43