Finding the Fourth Proportional to 1,384.45, 1,909.00 and 1,131.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.45 : 1,909.00 = 1,131.60 : x
2. Step 2: Convert to fraction form
   1,384.45/1,909.00 = 1,131.60/x
3. Step 3: Cross multiply
   1,384.45x = 1,909.00 × 1,131.60
4. Step 4: Simplify right side
   1,384.45x = 2,160,210.90
5. Step 5: Solve for x
   x = 2,160,210.90/1,384.45
6. Step 6: Final answer
   x = 1,560.33