Finding the Fourth Proportional to 2,213.67, 3,320.27 and 1,389.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.67 : 3,320.27 = 1,389.50 : x
2. Step 2: Convert to fraction form
   2,213.67/3,320.27 = 1,389.50/x
3. Step 3: Cross multiply
   2,213.67x = 3,320.27 × 1,389.50
4. Step 4: Simplify right side
   2,213.67x = 4,613,515.17
5. Step 5: Solve for x
   x = 4,613,515.17/2,213.67
6. Step 6: Final answer
   x = 2,084.10