Finding the Fourth Proportional to 1,109.00, 1,656.51 and 813.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.00 : 1,656.51 = 813.89 : x
2. Step 2: Convert to fraction form
   1,109.00/1,656.51 = 813.89/x
3. Step 3: Cross multiply
   1,109.00x = 1,656.51 × 813.89
4. Step 4: Simplify right side
   1,109.00x = 1,348,211.69
5. Step 5: Solve for x
   x = 1,348,211.69/1,109.00
6. Step 6: Final answer
   x = 1,215.71