Finding the Fourth Proportional to 1,340.63, 1,851.39 and 1,106.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.63 : 1,851.39 = 1,106.90 : x
2. Step 2: Convert to fraction form
   1,340.63/1,851.39 = 1,106.90/x
3. Step 3: Cross multiply
   1,340.63x = 1,851.39 × 1,106.90
4. Step 4: Simplify right side
   1,340.63x = 2,049,303.59
5. Step 5: Solve for x
   x = 2,049,303.59/1,340.63
6. Step 6: Final answer
   x = 1,528.61