Finding the Fourth Proportional to 2,109.90, 3,165.30 and 1,070.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.90 : 3,165.30 = 1,070.04 : x
2. Step 2: Convert to fraction form
   2,109.90/3,165.30 = 1,070.04/x
3. Step 3: Cross multiply
   2,109.90x = 3,165.30 × 1,070.04
4. Step 4: Simplify right side
   2,109.90x = 3,386,997.61
5. Step 5: Solve for x
   x = 3,386,997.61/2,109.90
6. Step 6: Final answer
   x = 1,605.29