Finding the Fourth Proportional to 1,214.78, 1,810.61 and 1,145.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,214.78 : 1,810.61 = 1,145.58 : x
2. Step 2: Convert to fraction form
   1,214.78/1,810.61 = 1,145.58/x
3. Step 3: Cross multiply
   1,214.78x = 1,810.61 × 1,145.58
4. Step 4: Simplify right side
   1,214.78x = 2,074,192.88
5. Step 5: Solve for x
   x = 2,074,192.88/1,214.78
6. Step 6: Final answer
   x = 1,707.47