Finding the Fourth Proportional to 1,406.80, 2,106.01 and 1,043.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.80 : 2,106.01 = 1,043.20 : x
2. Step 2: Convert to fraction form
   1,406.80/2,106.01 = 1,043.20/x
3. Step 3: Cross multiply
   1,406.80x = 2,106.01 × 1,043.20
4. Step 4: Simplify right side
   1,406.80x = 2,196,989.63
5. Step 5: Solve for x
   x = 2,196,989.63/1,406.80
6. Step 6: Final answer
   x = 1,561.69