Finding the Fourth Proportional to 10,389.48, 15,580.56 and 2,991.96

Step by Step Solution

1. Step 1: Write the proportion equation
   10,389.48 : 15,580.56 = 2,991.96 : x
2. Step 2: Convert to fraction form
   10,389.48/15,580.56 = 2,991.96/x
3. Step 3: Cross multiply
   10,389.48x = 15,580.56 × 2,991.96
4. Step 4: Simplify right side
   10,389.48x = 46,616,412.30
5. Step 5: Solve for x
   x = 46,616,412.30/10,389.48
6. Step 6: Final answer
   x = 4,486.89