Finding the Fourth Proportional to 2,127.20, 3,188.10 and 1,152.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,127.20 : 3,188.10 = 1,152.50 : x
2. Step 2: Convert to fraction form
   2,127.20/3,188.10 = 1,152.50/x
3. Step 3: Cross multiply
   2,127.20x = 3,188.10 × 1,152.50
4. Step 4: Simplify right side
   2,127.20x = 3,674,285.25
5. Step 5: Solve for x
   x = 3,674,285.25/2,127.20
6. Step 6: Final answer
   x = 1,727.29