Finding the Fourth Proportional to 9,912, 14,870.40 and 2,986.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,912 : 14,870.40 = 2,986.56 : x
2. Step 2: Convert to fraction form
   9,912/14,870.40 = 2,986.56/x
3. Step 3: Cross multiply
   9,912x = 14,870.40 × 2,986.56
4. Step 4: Simplify right side
   9,912x = 44,411,341.82
5. Step 5: Solve for x
   x = 44,411,341.82/9,912
6. Step 6: Final answer
   x = 4,480.56