Finding the Fourth Proportional to 1,216.08, 1,820.64 and 1,139.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.08 : 1,820.64 = 1,139.52 : x
2. Step 2: Convert to fraction form
   1,216.08/1,820.64 = 1,139.52/x
3. Step 3: Cross multiply
   1,216.08x = 1,820.64 × 1,139.52
4. Step 4: Simplify right side
   1,216.08x = 2,074,655.69
5. Step 5: Solve for x
   x = 2,074,655.69/1,216.08
6. Step 6: Final answer
   x = 1,706.02