Finding the Fourth Proportional to 3,765.57, 5,196.80 and 2,172.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,765.57 : 5,196.80 = 2,172.50 : x
2. Step 2: Convert to fraction form
   3,765.57/5,196.80 = 2,172.50/x
3. Step 3: Cross multiply
   3,765.57x = 5,196.80 × 2,172.50
4. Step 4: Simplify right side
   3,765.57x = 11,290,066.42
5. Step 5: Solve for x
   x = 11,290,066.42/3,765.57
6. Step 6: Final answer
   x = 2,998.24