Finding the Fourth Proportional to 1,665.31, 2,298.40 and 1,591.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.31 : 2,298.40 = 1,591.50 : x
2. Step 2: Convert to fraction form
   1,665.31/2,298.40 = 1,591.50/x
3. Step 3: Cross multiply
   1,665.31x = 2,298.40 × 1,591.50
4. Step 4: Simplify right side
   1,665.31x = 3,657,892.11
5. Step 5: Solve for x
   x = 3,657,892.11/1,665.31
6. Step 6: Final answer
   x = 2,196.53