Finding the Fourth Proportional to 1,388.76, 1,917.40 and 1,073.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.76 : 1,917.40 = 1,073.48 : x
2. Step 2: Convert to fraction form
   1,388.76/1,917.40 = 1,073.48/x
3. Step 3: Cross multiply
   1,388.76x = 1,917.40 × 1,073.48
4. Step 4: Simplify right side
   1,388.76x = 2,058,290.55
5. Step 5: Solve for x
   x = 2,058,290.55/1,388.76
6. Step 6: Final answer
   x = 1,482.11