Finding the Fourth Proportional to 1,218.30, 1,817.00 and 1,088.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218.30 : 1,817.00 = 1,088.70 : x
2. Step 2: Convert to fraction form
   1,218.30/1,817.00 = 1,088.70/x
3. Step 3: Cross multiply
   1,218.30x = 1,817.00 × 1,088.70
4. Step 4: Simplify right side
   1,218.30x = 1,978,162.46
5. Step 5: Solve for x
   x = 1,978,162.46/1,218.30
6. Step 6: Final answer
   x = 1,623.71