Finding the Fourth Proportional to 9,891.78, 14,839.12 and 2,870.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,891.78 : 14,839.12 = 2,870.88 : x
2. Step 2: Convert to fraction form
   9,891.78/14,839.12 = 2,870.88/x
3. Step 3: Cross multiply
   9,891.78x = 14,839.12 × 2,870.88
4. Step 4: Simplify right side
   9,891.78x = 42,601,251.45
5. Step 5: Solve for x
   x = 42,601,251.45/9,891.78
6. Step 6: Final answer
   x = 4,306.73