Finding the Fourth Proportional to 1,407.20, 2,109.28 and 676.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.20 : 2,109.28 = 676.32 : x
2. Step 2: Convert to fraction form
   1,407.20/2,109.28 = 676.32/x
3. Step 3: Cross multiply
   1,407.20x = 2,109.28 × 676.32
4. Step 4: Simplify right side
   1,407.20x = 1,426,548.25
5. Step 5: Solve for x
   x = 1,426,548.25/1,407.20
6. Step 6: Final answer
   x = 1,013.75