Finding the Fourth Proportional to 1,502.79, 2,073.76 and 839.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,502.79 : 2,073.76 = 839.50 : x
2. Step 2: Convert to fraction form
   1,502.79/2,073.76 = 839.50/x
3. Step 3: Cross multiply
   1,502.79x = 2,073.76 × 839.50
4. Step 4: Simplify right side
   1,502.79x = 1,740,921.52
5. Step 5: Solve for x
   x = 1,740,921.52/1,502.79
6. Step 6: Final answer
   x = 1,158.46