Finding the Fourth Proportional to 1,389.62, 1,917.58 and 760.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.62 : 1,917.58 = 760.10 : x
2. Step 2: Convert to fraction form
   1,389.62/1,917.58 = 760.10/x
3. Step 3: Cross multiply
   1,389.62x = 1,917.58 × 760.10
4. Step 4: Simplify right side
   1,389.62x = 1,457,552.56
5. Step 5: Solve for x
   x = 1,457,552.56/1,389.62
6. Step 6: Final answer
   x = 1,048.89