Finding the Fourth Proportional to 1,665.88, 2,290.62 and 1,505.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.88 : 2,290.62 = 1,505.50 : x
2. Step 2: Convert to fraction form
   1,665.88/2,290.62 = 1,505.50/x
3. Step 3: Cross multiply
   1,665.88x = 2,290.62 × 1,505.50
4. Step 4: Simplify right side
   1,665.88x = 3,448,528.41
5. Step 5: Solve for x
   x = 3,448,528.41/1,665.88
6. Step 6: Final answer
   x = 2,070.09