Finding the Fourth Proportional to 2,870.05, 3,962.17 and 1,930.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.05 : 3,962.17 = 1,930.78 : x
2. Step 2: Convert to fraction form
   2,870.05/3,962.17 = 1,930.78/x
3. Step 3: Cross multiply
   2,870.05x = 3,962.17 × 1,930.78
4. Step 4: Simplify right side
   2,870.05x = 7,650,077.53
5. Step 5: Solve for x
   x = 7,650,077.53/2,870.05
6. Step 6: Final answer
   x = 2,665.49