Finding the Fourth Proportional to 1,971.78, 2,719.71 and 1,225.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,971.78 : 2,719.71 = 1,225.86 : x
2. Step 2: Convert to fraction form
   1,971.78/2,719.71 = 1,225.86/x
3. Step 3: Cross multiply
   1,971.78x = 2,719.71 × 1,225.86
4. Step 4: Simplify right side
   1,971.78x = 3,333,983.70
5. Step 5: Solve for x
   x = 3,333,983.70/1,971.78
6. Step 6: Final answer
   x = 1,690.85