Finding the Fourth Proportional to 1,870.21, 2,581.28 and 1,240.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.21 : 2,581.28 = 1,240.77 : x
2. Step 2: Convert to fraction form
   1,870.21/2,581.28 = 1,240.77/x
3. Step 3: Cross multiply
   1,870.21x = 2,581.28 × 1,240.77
4. Step 4: Simplify right side
   1,870.21x = 3,202,774.79
5. Step 5: Solve for x
   x = 3,202,774.79/1,870.21
6. Step 6: Final answer
   x = 1,712.52