Finding the Fourth Proportional to 1,404.90, 2,108.70 and 712.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.90 : 2,108.70 = 712.35 : x
2. Step 2: Convert to fraction form
   1,404.90/2,108.70 = 712.35/x
3. Step 3: Cross multiply
   1,404.90x = 2,108.70 × 712.35
4. Step 4: Simplify right side
   1,404.90x = 1,502,132.45
5. Step 5: Solve for x
   x = 1,502,132.45/1,404.90
6. Step 6: Final answer
   x = 1,069.21