Finding the Fourth Proportional to 13,091.90, 18,058.55 and 7,782.75

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.90 : 18,058.55 = 7,782.75 : x
2. Step 2: Convert to fraction form
   13,091.90/18,058.55 = 7,782.75/x
3. Step 3: Cross multiply
   13,091.90x = 18,058.55 × 7,782.75
4. Step 4: Simplify right side
   13,091.90x = 140,545,141.10
5. Step 5: Solve for x
   x = 140,545,141.10/13,091.90
6. Step 6: Final answer
   x = 10,735.28