Finding the Fourth Proportional to 1,438.05, 1,984.50 and 808.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.05 : 1,984.50 = 808.60 : x
2. Step 2: Convert to fraction form
   1,438.05/1,984.50 = 808.60/x
3. Step 3: Cross multiply
   1,438.05x = 1,984.50 × 808.60
4. Step 4: Simplify right side
   1,438.05x = 1,604,665.46
5. Step 5: Solve for x
   x = 1,604,665.46/1,438.05
6. Step 6: Final answer
   x = 1,115.86