Finding the Fourth Proportional to 2,712.05, 4,068.06 and 764.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,712.05 : 4,068.06 = 764.21 : x
2. Step 2: Convert to fraction form
   2,712.05/4,068.06 = 764.21/x
3. Step 3: Cross multiply
   2,712.05x = 4,068.06 × 764.21
4. Step 4: Simplify right side
   2,712.05x = 3,108,848.31
5. Step 5: Solve for x
   x = 3,108,848.31/2,712.05
6. Step 6: Final answer
   x = 1,146.31