Finding the Fourth Proportional to 3,780.82, 5,670.72 and 1,315.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,780.82 : 5,670.72 = 1,315.42 : x
2. Step 2: Convert to fraction form
   3,780.82/5,670.72 = 1,315.42/x
3. Step 3: Cross multiply
   3,780.82x = 5,670.72 × 1,315.42
4. Step 4: Simplify right side
   3,780.82x = 7,459,378.50
5. Step 5: Solve for x
   x = 7,459,378.50/3,780.82
6. Step 6: Final answer
   x = 1,972.95