Finding the Fourth Proportional to 1,994.31, 2,751.40 and 1,247.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,994.31 : 2,751.40 = 1,247.99 : x
2. Step 2: Convert to fraction form
   1,994.31/2,751.40 = 1,247.99/x
3. Step 3: Cross multiply
   1,994.31x = 2,751.40 × 1,247.99
4. Step 4: Simplify right side
   1,994.31x = 3,433,719.69
5. Step 5: Solve for x
   x = 3,433,719.69/1,994.31
6. Step 6: Final answer
   x = 1,721.76