Finding the Fourth Proportional to 2,196.01, 3,030.78 and 1,312.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,196.01 : 3,030.78 = 1,312.39 : x
2. Step 2: Convert to fraction form
   2,196.01/3,030.78 = 1,312.39/x
3. Step 3: Cross multiply
   2,196.01x = 3,030.78 × 1,312.39
4. Step 4: Simplify right side
   2,196.01x = 3,977,565.36
5. Step 5: Solve for x
   x = 3,977,565.36/2,196.01
6. Step 6: Final answer
   x = 1,811.27