Finding the Fourth Proportional to 1,210.00, 1,670.60 and 1,078.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210.00 : 1,670.60 = 1,078.78 : x
2. Step 2: Convert to fraction form
   1,210.00/1,670.60 = 1,078.78/x
3. Step 3: Cross multiply
   1,210.00x = 1,670.60 × 1,078.78
4. Step 4: Simplify right side
   1,210.00x = 1,802,196.12
5. Step 5: Solve for x
   x = 1,802,196.12/1,210.00
6. Step 6: Final answer
   x = 1,489.42