Finding the Fourth Proportional to 1,665.12, 2,298.14 and 1,591.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.12 : 2,298.14 = 1,591.31 : x
2. Step 2: Convert to fraction form
   1,665.12/2,298.14 = 1,591.31/x
3. Step 3: Cross multiply
   1,665.12x = 2,298.14 × 1,591.31
4. Step 4: Simplify right side
   1,665.12x = 3,657,051.40
5. Step 5: Solve for x
   x = 3,657,051.40/1,665.12
6. Step 6: Final answer
   x = 2,196.27