Finding the Fourth Proportional to 1,385.43, 1,912.61 and 1,069.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.43 : 1,912.61 = 1,069.99 : x
2. Step 2: Convert to fraction form
   1,385.43/1,912.61 = 1,069.99/x
3. Step 3: Cross multiply
   1,385.43x = 1,912.61 × 1,069.99
4. Step 4: Simplify right side
   1,385.43x = 2,046,467.03
5. Step 5: Solve for x
   x = 2,046,467.03/1,385.43
6. Step 6: Final answer
   x = 1,477.13