Finding the Fourth Proportional to 3,780.47, 5,671.67 and 1,315.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,780.47 : 5,671.67 = 1,315.33 : x
2. Step 2: Convert to fraction form
   3,780.47/5,671.67 = 1,315.33/x
3. Step 3: Cross multiply
   3,780.47x = 5,671.67 × 1,315.33
4. Step 4: Simplify right side
   3,780.47x = 7,460,096.95
5. Step 5: Solve for x
   x = 7,460,096.95/3,780.47
6. Step 6: Final answer
   x = 1,973.32