Finding the Fourth Proportional to 2,870.01, 4,302.28 and 920.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,870.01 : 4,302.28 = 920.88 : x
2. Step 2: Convert to fraction form
   2,870.01/4,302.28 = 920.88/x
3. Step 3: Cross multiply
   2,870.01x = 4,302.28 × 920.88
4. Step 4: Simplify right side
   2,870.01x = 3,961,883.61
5. Step 5: Solve for x
   x = 3,961,883.61/2,870.01
6. Step 6: Final answer
   x = 1,380.44