Finding the Fourth Proportional to 1,817.42, 2,507.39 and 1,188.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,817.42 : 2,507.39 = 1,188.31 : x
2. Step 2: Convert to fraction form
   1,817.42/2,507.39 = 1,188.31/x
3. Step 3: Cross multiply
   1,817.42x = 2,507.39 × 1,188.31
4. Step 4: Simplify right side
   1,817.42x = 2,979,544.40
5. Step 5: Solve for x
   x = 2,979,544.40/1,817.42
6. Step 6: Final answer
   x = 1,639.44