Finding the Fourth Proportional to 1,913.31, 2,870.27 and 939.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,913.31 : 2,870.27 = 939.48 : x
2. Step 2: Convert to fraction form
   1,913.31/2,870.27 = 939.48/x
3. Step 3: Cross multiply
   1,913.31x = 2,870.27 × 939.48
4. Step 4: Simplify right side
   1,913.31x = 2,696,556.56
5. Step 5: Solve for x
   x = 2,696,556.56/1,913.31
6. Step 6: Final answer
   x = 1,409.37