Finding the Fourth Proportional to 12,741.86, 19,091.21 and 7,801.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,741.86 : 19,091.21 = 7,801.18 : x
2. Step 2: Convert to fraction form
   12,741.86/19,091.21 = 7,801.18/x
3. Step 3: Cross multiply
   12,741.86x = 19,091.21 × 7,801.18
4. Step 4: Simplify right side
   12,741.86x = 148,933,922.78
5. Step 5: Solve for x
   x = 148,933,922.78/12,741.86
6. Step 6: Final answer
   x = 11,688.56