Finding the Fourth Proportional to 1,385.91, 1,912.01 and 914.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.91 : 1,912.01 = 914.05 : x
2. Step 2: Convert to fraction form
   1,385.91/1,912.01 = 914.05/x
3. Step 3: Cross multiply
   1,385.91x = 1,912.01 × 914.05
4. Step 4: Simplify right side
   1,385.91x = 1,747,670.56
5. Step 5: Solve for x
   x = 1,747,670.56/1,385.91
6. Step 6: Final answer
   x = 1,261.03