Finding the Fourth Proportional to 1,569.78, 2,161.35 and 1,423.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,569.78 : 2,161.35 = 1,423.98 : x
2. Step 2: Convert to fraction form
   1,569.78/2,161.35 = 1,423.98/x
3. Step 3: Cross multiply
   1,569.78x = 2,161.35 × 1,423.98
4. Step 4: Simplify right side
   1,569.78x = 3,077,719.17
5. Step 5: Solve for x
   x = 3,077,719.17/1,569.78
6. Step 6: Final answer
   x = 1,960.61