Finding the Fourth Proportional to 2,196.72, 3,030.21 and 1,312.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.72 : 3,030.21 = 1,312.20 : x
2. Step 2: Convert to fraction form
   2,196.72/3,030.21 = 1,312.20/x
3. Step 3: Cross multiply
   2,196.72x = 3,030.21 × 1,312.20
4. Step 4: Simplify right side
   2,196.72x = 3,976,241.56
5. Step 5: Solve for x
   x = 3,976,241.56/2,196.72
6. Step 6: Final answer
   x = 1,810.08