Finding the Fourth Proportional to 3,456.45, 5,184.86 and 991.63

Step by Step Solution

1. Step 1: Write the proportion equation
   3,456.45 : 5,184.86 = 991.63 : x
2. Step 2: Convert to fraction form
   3,456.45/5,184.86 = 991.63/x
3. Step 3: Cross multiply
   3,456.45x = 5,184.86 × 991.63
4. Step 4: Simplify right side
   3,456.45x = 5,141,462.72
5. Step 5: Solve for x
   x = 5,141,462.72/3,456.45
6. Step 6: Final answer
   x = 1,487.50