Finding the Fourth Proportional to 3,612.32, 4,985.46 and 2,120.81

Step by Step Solution

1. Step 1: Write the proportion equation
   3,612.32 : 4,985.46 = 2,120.81 : x
2. Step 2: Convert to fraction form
   3,612.32/4,985.46 = 2,120.81/x
3. Step 3: Cross multiply
   3,612.32x = 4,985.46 × 2,120.81
4. Step 4: Simplify right side
   3,612.32x = 10,573,188.50
5. Step 5: Solve for x
   x = 10,573,188.50/3,612.32
6. Step 6: Final answer
   x = 2,926.98