Finding the Fourth Proportional to 1,590.78, 2,196.10 and 1,235.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,590.78 : 2,196.10 = 1,235.91 : x
2. Step 2: Convert to fraction form
   1,590.78/2,196.10 = 1,235.91/x
3. Step 3: Cross multiply
   1,590.78x = 2,196.10 × 1,235.91
4. Step 4: Simplify right side
   1,590.78x = 2,714,181.95
5. Step 5: Solve for x
   x = 2,714,181.95/1,590.78
6. Step 6: Final answer
   x = 1,706.20