Finding the Fourth Proportional to 1,400.22, 2,100.51 and 426.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.22 : 2,100.51 = 426.15 : x
2. Step 2: Convert to fraction form
   1,400.22/2,100.51 = 426.15/x
3. Step 3: Cross multiply
   1,400.22x = 2,100.51 × 426.15
4. Step 4: Simplify right side
   1,400.22x = 895,132.34
5. Step 5: Solve for x
   x = 895,132.34/1,400.22
6. Step 6: Final answer
   x = 639.28