Finding the Fourth Proportional to 1,389.72, 1,917.73 and 760.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.72 : 1,917.73 = 760.13 : x
2. Step 2: Convert to fraction form
   1,389.72/1,917.73 = 760.13/x
3. Step 3: Cross multiply
   1,389.72x = 1,917.73 × 760.13
4. Step 4: Simplify right side
   1,389.72x = 1,457,724.10
5. Step 5: Solve for x
   x = 1,457,724.10/1,389.72
6. Step 6: Final answer
   x = 1,048.93