Finding the Fourth Proportional to 1,342.10, 2,011.91 and 931.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.10 : 2,011.91 = 931.43 : x
2. Step 2: Convert to fraction form
   1,342.10/2,011.91 = 931.43/x
3. Step 3: Cross multiply
   1,342.10x = 2,011.91 × 931.43
4. Step 4: Simplify right side
   1,342.10x = 1,873,938.61
5. Step 5: Solve for x
   x = 1,873,938.61/1,342.10
6. Step 6: Final answer
   x = 1,396.28