Finding the Fourth Proportional to 1,370.86, 1,890.34 and 1,259.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,370.86 : 1,890.34 = 1,259.89 : x
2. Step 2: Convert to fraction form
   1,370.86/1,890.34 = 1,259.89/x
3. Step 3: Cross multiply
   1,370.86x = 1,890.34 × 1,259.89
4. Step 4: Simplify right side
   1,370.86x = 2,381,620.46
5. Step 5: Solve for x
   x = 2,381,620.46/1,370.86
6. Step 6: Final answer
   x = 1,737.32