Finding the Fourth Proportional to 1,406.95, 1,940.54 and 1,247.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.95 : 1,940.54 = 1,247.61 : x
2. Step 2: Convert to fraction form
   1,406.95/1,940.54 = 1,247.61/x
3. Step 3: Cross multiply
   1,406.95x = 1,940.54 × 1,247.61
4. Step 4: Simplify right side
   1,406.95x = 2,421,038.15
5. Step 5: Solve for x
   x = 2,421,038.15/1,406.95
6. Step 6: Final answer
   x = 1,720.77