Finding the Fourth Proportional to 1,389.76, 1,917.86 and 760.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.76 : 1,917.86 = 760.29 : x
2. Step 2: Convert to fraction form
   1,389.76/1,917.86 = 760.29/x
3. Step 3: Cross multiply
   1,389.76x = 1,917.86 × 760.29
4. Step 4: Simplify right side
   1,389.76x = 1,458,129.78
5. Step 5: Solve for x
   x = 1,458,129.78/1,389.76
6. Step 6: Final answer
   x = 1,049.20