Finding the Fourth Proportional to 9,991.31, 14,995.61 and 3,839.63

Step by Step Solution

1. Step 1: Write the proportion equation
   9,991.31 : 14,995.61 = 3,839.63 : x
2. Step 2: Convert to fraction form
   9,991.31/14,995.61 = 3,839.63/x
3. Step 3: Cross multiply
   9,991.31x = 14,995.61 × 3,839.63
4. Step 4: Simplify right side
   9,991.31x = 57,577,574.83
5. Step 5: Solve for x
   x = 57,577,574.83/9,991.31
6. Step 6: Final answer
   x = 5,762.77