Finding the Fourth Proportional to 2,115.39, 2,919.30 and 1,406.00

Step by Step Solution

1. Step 1: Write the proportion equation
   2,115.39 : 2,919.30 = 1,406.00 : x
2. Step 2: Convert to fraction form
   2,115.39/2,919.30 = 1,406.00/x
3. Step 3: Cross multiply
   2,115.39x = 2,919.30 × 1,406.00
4. Step 4: Simplify right side
   2,115.39x = 4,104,526.48
5. Step 5: Solve for x
   x = 4,104,526.48/2,115.39
6. Step 6: Final answer
   x = 1,940.32