Finding the Fourth Proportional to 2,385.16, 3,570.52 and 2,165.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.16 : 3,570.52 = 2,165.78 : x
2. Step 2: Convert to fraction form
   2,385.16/3,570.52 = 2,165.78/x
3. Step 3: Cross multiply
   2,385.16x = 3,570.52 × 2,165.78
4. Step 4: Simplify right side
   2,385.16x = 7,732,960.81
5. Step 5: Solve for x
   x = 7,732,960.81/2,385.16
6. Step 6: Final answer
   x = 3,242.11