Finding the Fourth Proportional to 1,384.12, 1,909.76 and 1,011.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.12 : 1,909.76 = 1,011.30 : x
2. Step 2: Convert to fraction form
   1,384.12/1,909.76 = 1,011.30/x
3. Step 3: Cross multiply
   1,384.12x = 1,909.76 × 1,011.30
4. Step 4: Simplify right side
   1,384.12x = 1,931,340.29
5. Step 5: Solve for x
   x = 1,931,340.29/1,384.12
6. Step 6: Final answer
   x = 1,395.36