Finding the Fourth Proportional to 2,635.86, 3,952.70 and 991.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,635.86 : 3,952.70 = 991.52 : x
2. Step 2: Convert to fraction form
   2,635.86/3,952.70 = 991.52/x
3. Step 3: Cross multiply
   2,635.86x = 3,952.70 × 991.52
4. Step 4: Simplify right side
   2,635.86x = 3,919,181.10
5. Step 5: Solve for x
   x = 3,919,181.10/2,635.86
6. Step 6: Final answer
   x = 1,486.87