Finding the Fourth Proportional to 1,387.22, 1,914.71 and 890.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.22 : 1,914.71 = 890.01 : x
2. Step 2: Convert to fraction form
   1,387.22/1,914.71 = 890.01/x
3. Step 3: Cross multiply
   1,387.22x = 1,914.71 × 890.01
4. Step 4: Simplify right side
   1,387.22x = 1,704,106.60
5. Step 5: Solve for x
   x = 1,704,106.60/1,387.22
6. Step 6: Final answer
   x = 1,228.44