Finding the Fourth Proportional to 2,437.78, 3,364.29 and 1,389.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,437.78 : 3,364.29 = 1,389.86 : x
2. Step 2: Convert to fraction form
   2,437.78/3,364.29 = 1,389.86/x
3. Step 3: Cross multiply
   2,437.78x = 3,364.29 × 1,389.86
4. Step 4: Simplify right side
   2,437.78x = 4,675,892.10
5. Step 5: Solve for x
   x = 4,675,892.10/2,437.78
6. Step 6: Final answer
   x = 1,918.09