Finding the Fourth Proportional to 1,659.86, 2,290.25 and 1,070.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.86 : 2,290.25 = 1,070.30 : x
2. Step 2: Convert to fraction form
   1,659.86/2,290.25 = 1,070.30/x
3. Step 3: Cross multiply
   1,659.86x = 2,290.25 × 1,070.30
4. Step 4: Simplify right side
   1,659.86x = 2,451,254.58
5. Step 5: Solve for x
   x = 2,451,254.58/1,659.86
6. Step 6: Final answer
   x = 1,476.78