Finding the Fourth Proportional to 1,477.21, 2,213.21 and 1,389.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,477.21 : 2,213.21 = 1,389.42 : x
2. Step 2: Convert to fraction form
   1,477.21/2,213.21 = 1,389.42/x
3. Step 3: Cross multiply
   1,477.21x = 2,213.21 × 1,389.42
4. Step 4: Simplify right side
   1,477.21x = 3,075,073.90
5. Step 5: Solve for x
   x = 3,075,073.90/1,477.21
6. Step 6: Final answer
   x = 2,081.67