Finding the Fourth Proportional to 3,456.51, 5,184.74 and 991.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,456.51 : 5,184.74 = 991.34 : x
2. Step 2: Convert to fraction form
   3,456.51/5,184.74 = 991.34/x
3. Step 3: Cross multiply
   3,456.51x = 5,184.74 × 991.34
4. Step 4: Simplify right side
   3,456.51x = 5,139,809.27
5. Step 5: Solve for x
   x = 5,139,809.27/3,456.51
6. Step 6: Final answer
   x = 1,486.99