Finding the Fourth Proportional to 3,764.53, 5,647.13 and 991.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,764.53 : 5,647.13 = 991.15 : x
2. Step 2: Convert to fraction form
   3,764.53/5,647.13 = 991.15/x
3. Step 3: Cross multiply
   3,764.53x = 5,647.13 × 991.15
4. Step 4: Simplify right side
   3,764.53x = 5,597,152.90
5. Step 5: Solve for x
   x = 5,597,152.90/3,764.53
6. Step 6: Final answer
   x = 1,486.81