Finding the Fourth Proportional to 1,385.40, 1,909.65 and 1,012.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.40 : 1,909.65 = 1,012.41 : x
2. Step 2: Convert to fraction form
   1,385.40/1,909.65 = 1,012.41/x
3. Step 3: Cross multiply
   1,385.40x = 1,909.65 × 1,012.41
4. Step 4: Simplify right side
   1,385.40x = 1,933,348.76
5. Step 5: Solve for x
   x = 1,933,348.76/1,385.40
6. Step 6: Final answer
   x = 1,395.52