Finding the Fourth Proportional to 8,991.90, 13,487.39 and 3,148.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,991.90 : 13,487.39 = 3,148.05 : x
2. Step 2: Convert to fraction form
   8,991.90/13,487.39 = 3,148.05/x
3. Step 3: Cross multiply
   8,991.90x = 13,487.39 × 3,148.05
4. Step 4: Simplify right side
   8,991.90x = 42,458,978.09
5. Step 5: Solve for x
   x = 42,458,978.09/8,991.90
6. Step 6: Final answer
   x = 4,721.91