Finding the Fourth Proportional to 2,157.80, 3,236.72 and 1,061.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.80 : 3,236.72 = 1,061.20 : x
2. Step 2: Convert to fraction form
   2,157.80/3,236.72 = 1,061.20/x
3. Step 3: Cross multiply
   2,157.80x = 3,236.72 × 1,061.20
4. Step 4: Simplify right side
   2,157.80x = 3,434,807.26
5. Step 5: Solve for x
   x = 3,434,807.26/2,157.80
6. Step 6: Final answer
   x = 1,591.81