Finding the Fourth Proportional to 2,100.60, 2,900.07 and 1,355.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,100.60 : 2,900.07 = 1,355.67 : x
2. Step 2: Convert to fraction form
   2,100.60/2,900.07 = 1,355.67/x
3. Step 3: Cross multiply
   2,100.60x = 2,900.07 × 1,355.67
4. Step 4: Simplify right side
   2,100.60x = 3,931,537.90
5. Step 5: Solve for x
   x = 3,931,537.90/2,100.60
6. Step 6: Final answer
   x = 1,871.63