Finding the Fourth Proportional to 1,928.32, 2,886.72 and 1,242.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,928.32 : 2,886.72 = 1,242.88 : x
2. Step 2: Convert to fraction form
   1,928.32/2,886.72 = 1,242.88/x
3. Step 3: Cross multiply
   1,928.32x = 2,886.72 × 1,242.88
4. Step 4: Simplify right side
   1,928.32x = 3,587,846.55
5. Step 5: Solve for x
   x = 3,587,846.55/1,928.32
6. Step 6: Final answer
   x = 1,860.61