Finding the Fourth Proportional to 1,400.32, 2,100.72 and 1,256.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,400.32 : 2,100.72 = 1,256.80 : x
2. Step 2: Convert to fraction form
   1,400.32/2,100.72 = 1,256.80/x
3. Step 3: Cross multiply
   1,400.32x = 2,100.72 × 1,256.80
4. Step 4: Simplify right side
   1,400.32x = 2,640,184.90
5. Step 5: Solve for x
   x = 2,640,184.90/1,400.32
6. Step 6: Final answer
   x = 1,885.42