Finding the Fourth Proportional to 1,381.86, 1,909.98 and 1,031.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.86 : 1,909.98 = 1,031.94 : x
2. Step 2: Convert to fraction form
   1,381.86/1,909.98 = 1,031.94/x
3. Step 3: Cross multiply
   1,381.86x = 1,909.98 × 1,031.94
4. Step 4: Simplify right side
   1,381.86x = 1,970,984.76
5. Step 5: Solve for x
   x = 1,970,984.76/1,381.86
6. Step 6: Final answer
   x = 1,426.33