Finding the Fourth Proportional to 2,166.72, 2,990.40 and 1,235.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,166.72 : 2,990.40 = 1,235.52 : x
2. Step 2: Convert to fraction form
   2,166.72/2,990.40 = 1,235.52/x
3. Step 3: Cross multiply
   2,166.72x = 2,990.40 × 1,235.52
4. Step 4: Simplify right side
   2,166.72x = 3,694,699.01
5. Step 5: Solve for x
   x = 3,694,699.01/2,166.72
6. Step 6: Final answer
   x = 1,705.20