Finding the Fourth Proportional to 2,131.62, 2,939.76 and 1,384.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.62 : 2,939.76 = 1,384.88 : x
2. Step 2: Convert to fraction form
   2,131.62/2,939.76 = 1,384.88/x
3. Step 3: Cross multiply
   2,131.62x = 2,939.76 × 1,384.88
4. Step 4: Simplify right side
   2,131.62x = 4,071,214.83
5. Step 5: Solve for x
   x = 4,071,214.83/2,131.62
6. Step 6: Final answer
   x = 1,909.92