Finding the Fourth Proportional to 2,070.32, 2,857.20 and 1,186.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.32 : 2,857.20 = 1,186.16 : x
2. Step 2: Convert to fraction form
   2,070.32/2,857.20 = 1,186.16/x
3. Step 3: Cross multiply
   2,070.32x = 2,857.20 × 1,186.16
4. Step 4: Simplify right side
   2,070.32x = 3,389,096.35
5. Step 5: Solve for x
   x = 3,389,096.35/2,070.32
6. Step 6: Final answer
   x = 1,636.99