Finding the Fourth Proportional to 1,210.01, 1,669.82 and 789.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210.01 : 1,669.82 = 789.89 : x
2. Step 2: Convert to fraction form
   1,210.01/1,669.82 = 789.89/x
3. Step 3: Cross multiply
   1,210.01x = 1,669.82 × 789.89
4. Step 4: Simplify right side
   1,210.01x = 1,318,961.82
5. Step 5: Solve for x
   x = 1,318,961.82/1,210.01
6. Step 6: Final answer
   x = 1,090.05