Finding the Fourth Proportional to 3,612.77, 4,985.69 and 2,120.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,612.77 : 4,985.69 = 2,120.15 : x
2. Step 2: Convert to fraction form
   3,612.77/4,985.69 = 2,120.15/x
3. Step 3: Cross multiply
   3,612.77x = 4,985.69 × 2,120.15
4. Step 4: Simplify right side
   3,612.77x = 10,570,375.12
5. Step 5: Solve for x
   x = 10,570,375.12/3,612.77
6. Step 6: Final answer
   x = 2,925.84