Finding the Fourth Proportional to 2,377.35, 3,564.10 and 991.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,377.35 : 3,564.10 = 991.72 : x
2. Step 2: Convert to fraction form
   2,377.35/3,564.10 = 991.72/x
3. Step 3: Cross multiply
   2,377.35x = 3,564.10 × 991.72
4. Step 4: Simplify right side
   2,377.35x = 3,534,589.25
5. Step 5: Solve for x
   x = 3,534,589.25/2,377.35
6. Step 6: Final answer
   x = 1,486.78