Finding the Fourth Proportional to 1,553.78, 2,141.81 and 1,379.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.78 : 2,141.81 = 1,379.06 : x
2. Step 2: Convert to fraction form
   1,553.78/2,141.81 = 1,379.06/x
3. Step 3: Cross multiply
   1,553.78x = 2,141.81 × 1,379.06
4. Step 4: Simplify right side
   1,553.78x = 2,953,684.50
5. Step 5: Solve for x
   x = 2,953,684.50/1,553.78
6. Step 6: Final answer
   x = 1,900.97