Finding the Fourth Proportional to 1,385.18, 1,908.59 and 1,070.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.18 : 1,908.59 = 1,070.49 : x
2. Step 2: Convert to fraction form
   1,385.18/1,908.59 = 1,070.49/x
3. Step 3: Cross multiply
   1,385.18x = 1,908.59 × 1,070.49
4. Step 4: Simplify right side
   1,385.18x = 2,043,121.16
5. Step 5: Solve for x
   x = 2,043,121.16/1,385.18
6. Step 6: Final answer
   x = 1,474.99